{"data":{"id":"nine-giant-building-projects-that-were-seriously-backed-and-49af97","slug":"nine-giant-building-projects-that-were-seriously-backed-and-49af97","title":"Nine giant building projects that were seriously backed — and why only one is rising","dek":"Backed by Tokyo builders, Saudi Arabia's wealth fund and Hong Kong's government, the schemes range from a pyramid over the bay to a ribbon to space — most are blocked because the ultra-strong material can't be made at scale or the budgets dwarf their funders.","published_at":"2026-09-23T13:04:17.382038+00:00","status":"publishable","tags":["Shimizu Corporation","Adrian Smith + Gordon Gill Architecture","BIG - Bjarke Ingels Group","Busan Metropolitan City","Jeddah Economic Company"],"places":["Japan","Saudi Arabia","South Korea"],"quick_take":{"whatHappened":"Nine seriously backed megastructures — from a pyramid over Tokyo Bay and a ribbon to space to a 170km mirrored wall city — were graded by progress from paper to prototype to rising, and only Jeddah's kilometre-high tower is actively climbing again after a seven-year freeze.","whyItMatters":"It gives a filter for the next viral rendering: is the blocker physics, money and politics, or the base rate that nine in ten megaprojects blow budget and schedule with fat-tail risk.","whatIsUncertain":"Whether a defect-free ultra-strong material can ever be made at kilometre scale, or whether oil-funded states can sustain trillion-scale spending long enough to finish a wall city or island chain."},"markdown":"Nine huge building ideas — a 2km pyramid over Tokyo Bay, a 96,000km ribbon to space, a 170km mirrored wall city in the desert — sort by how far they actually got. Only one is rising. The rest are stopped by one of three filters: a material that does not exist at scale, money and politics, or the fact that most megaprojects blow budget and schedule.\n\n\n\n![Where nine civilization-scale projects stand today](/analytics/nine-giant-building-projects-that-were-seriously-backed-and-49af97/analytic_req_mega_status_01.svg)\n\n*Nine megastructures, how far each got and what stops it. Nine civilization-scale projects are ordered from paper plans to active construction; only Jeddah Tower is currently rising. The Line is shown at its reported reduction from a 170 km vision to a 2.4 km planned segment, while the blocker labels summarize the constraint described in the supplied evidence. — AI-assisted analytic, built only from real cited or sourced data. Source: The Economic Times, SoraNews24, Obayashi Corporation. As of 2026-09-23.*\n\n\"Seriously tried\" here means a real builder or state with money and power behind it: Shimizu and Obayashi, builders of much of Tokyo's skyline; Saudi Arabia's Public Investment Fund (PIF), the fund behind NEOM; Hong Kong's government; Jeddah Economic Company; and Oceanix with UN-Habitat, the UN housing and settlements programme, and the port city of Busan. That credential is what makes the sorting useful the next time a rendering goes viral.\n\n## Shimizu Mega-City Pyramid — Tokyo Bay\n\n![An architect's impression of a colossal open-lattice pyramid rising from the sea, with stacked city blocks visible inside the truss structure.](/analytics/nine-giant-building-projects-that-were-seriously-backed-and-49af97/figure_shimizu-pyramid.jpg)\n\nNot a tower but a city as one building. Shimizu's lattice, patented in 1992 and unveiled in 2004, would stand 2,004m over Tokyo Bay — about 14 times the Great Pyramid and 2.5 times the Burj Khalifa — holding 750,000 to 1 million people in blocks hung inside an open truss.\n\nIt answers Greater Tokyo's scarcity — about 33.4 million people with little buildable land — by building over water, with a truss meant to flex in quakes and typhoons. Shimizu's own timeline, start as early as 2030 and finish around 2110, signals the status: paper only. Conventional steel and concrete are too heavy. The design needs mass-produced, defect-free carbon nanotubes and graphene at strengths lab samples cannot yet deliver.\n\n## Obayashi Space Elevator\n\n![An architect's impression of an ultra-thin ribbon stretching vertically from a floating ocean platform through clouds into orbit, with a small climber on the line.](/analytics/nine-giant-building-projects-that-were-seriously-backed-and-49af97/figure_space-elevator.jpg)\n\nObayashi, builder of Tokyo Skytree, proposed in 2012 the most extreme tensile structure: a 96,000km carbon-nanotube ribbon from a floating Earth Port on the equator to beyond geostationary orbit at 36,000km, ending in a counterweight, with climbers crawling at about 200 km/h — a week to orbit.\n\nObayashi's own simulation says it is feasible only if a ribbon at 150 gigapascals — a measure of pulling strength — can be made, then built over about 20 years by launching a seed ribbon and thickening it to 7,000 tons. The physics of hanging is sound; the material is not. No one can spin continuous, defect-free ribbon at kilometre scale, let alone 96,000km. A small 2018 test with two 10cm CubeSats, mini-satellites, and a 10m tether was reported at the time as the first climber movement in space.\n\n## The Line at NEOM\n\n![An architect's impression of two parallel mirrored walls 500m high forming a narrow linear city stretching across desert toward the sea.](/analytics/nine-giant-building-projects-that-were-seriously-backed-and-49af97/figure_the-line.jpg)\n\nThe Line is the only project here with state-scale earthworks: two parallel mirrored walls 500m high, 200m wide, running 170km inland from the Red Sea, enclosing 34 sq km for 9 million people at about 265,000 per sq km, ten times Manhattan, car-free and net-zero, inside NEOM in Saudi Arabia.\n\nBacked by PIF, it moved from a $500bn pitch to internal estimates of $1.6tn then about $4.5tn. Large earthworks were visible in satellite images by October 2024, with press reports of a SAR 700m concrete factory — in Saudi riyals — and about 1,000 of 30,000-plus piles placed with 115,000 workers on site.\n\nThen scale collapsed. Documents cited by press cut the 2030 target from 170km and 1.5 million people to a 2.4km segment for about 300,000. By July 2025 Saudi Arabia had asked consulting firms for a strategic review as oil prices and budget shortfalls forced reprioritization, with reports of relocating NEOM staff to Riyadh and later reports of suspended work and contractor cancellations. Engineers say the walls are buildable; the veto has been money, oil-price softness and politics. No residents have moved in.\n\nThat veto includes human cost. Saudi authorities forcibly displaced Howeitat tribe members for NEOM, demolishing villages and detaining dozens, with UN experts saying in May 2023 the evictions since January 2020 amounted to forced evictions under international law. A former intelligence officer testified he was ordered in April 2020 to clear al-Khuraybah with lethal force licensed; resident Abdul Rahim al-Huwaiti was shot dead on 13 April 2020 after refusing valuation. Inside France's EDF, most hydro-engineering staff surveyed opposed involvement, citing huge carbon costs, and the company was dropped in March 2025.\n\n## Oceanix Busan\n\nThe most modest and most plausible floating city: three linked platforms for 12,000 people, expandable to 100,000, designed by BIG-Bjarke Ingels Group and SAMOO with Arup for Oceanix with UN-Habitat and Busan.\n\nIt extends a city of 3.4 million with bridges to land, net-zero power from solar, closed-loop water and waste, and habitat regeneration — a climate-adaptation prototype for coastal populations. Unveiled at the UN in April 2022 and slated to start in 2023 tied to Busan's Expo 2030 bid, UN-Habitat said in May 2024 it was being implemented off North Port. No full neighbourhood is operational; costs and the absence of a Korean legal framework for floating habitation and insurance keep it at prototype.\n\n## Lantau Tomorrow Vision / Kau Yi Chau\n\nHong Kong's answer to the world's most unaffordable housing — 220,000 people in subdivided \"coffin homes\" and a 5.3-year wait for public housing — was to make land. Reclamation, making new land by filling sea with sand and rock, already used on 25% of Hong Kong's coastline, would create artificial islands for 550,000 people and a third business district.\n\nAnnounced in October 2018 at HK$624bn, later HK$580bn, it was the city's most expensive infrastructure ever, with first intake planned for 2032. In September 2025 Development Secretary Bernadette Linn shelved it: no \"necessary conditions\" within the current term, environmental assessment halted, priority shifted to the Northern Metropolis. The blockers were fiscal — costs against HK$400bn in expected land revenue, with warnings reserves could be drained in a decade — and ecological: green groups opposed loss of Chinese white dolphin habitat, down from 188 in 2003 to three or four after airport reclamation, and massive sand mining.\n\n## Jeddah Tower\n\nThe one actively rising: 1,008m, 167 floors on the Red Sea, 170m above the Burj Khalifa and designed by the same architect, Adrian Smith with Gordon Gill, in a tapered form to shed wind. Centrepiece of the $20bn Jeddah Economic City, it holds hotel, apartments, offices and a 660m observation deck.\n\nAfter reaching about 38 floors by 2016, work stopped in 2018 for seven years when contractor Saudi Binladin Group was caught in the anti-corruption purge and financing froze. Rehired in late 2024 on a SR7.2bn ($2bn) contract, with Turner Construction managing from March 2025, it restarted in January 2025 at about a floor every three to four days, reaching 69-80 floors and 454m by late 2025, targeting 2028. The blocker was politics and cash, not physics — though pumping concrete at a kilometre still tests engineering.\n\n## Atlantropa\n\nGerman architect Herman Sörgel's Atlantropa (1928-1952) is the archetype: dam the Strait of Gibraltar with foundations crowned by a tower, plus dams at Sicily-Tunisia and the Dardanelles, to lower the Mediterranean and expose 576,000 sq km — a fifth of the sea — and generate 110,000 MW, half of Europe's needs then, over 100-150 years.\n\nIt fascinated the public for decades but was never funded, rejected by the Nazis as anti-Eurasian, and rendered obsolete by nuclear power and decolonization: Venice stranded inland, the Levant gaining land without consent, salinity and climate collapsing in a basin cut off from the Atlantic, under European control. Sörgel died in 1952 after being struck by a car; his institute lasted into the 1960s. Status: never built.\n\n## The material that doesn't exist yet\n\nThe Japanese pyramid and the space elevator share one quantified bottleneck. The best lab carbon-nanotube fiber reported in 2026 reaches 12.5 gigapascals — about 12 times below the 150 gigapascals Obayashi assumes for a 96,000km ribbon, and only a fraction of individual tubes because defects weaken the macroscopic fiber. Theory promises about 200 gigapascals; lab reality is lower, and no one can spin defect-free continuous ribbon at kilometre scale. Builders call the designs stepping stones awaiting future materials; skeptics note there is no path today to a defect-free ribbon at that length, and for The Line, unresolved wind, heat, seismic and safety gaps underline that \"awaiting material\" understates the barrier.\n\n## The iron law\n\nEven buildable projects sit in a distribution where overrun is the norm. Bent Flyvbjerg's dataset of more than 16,000 projects in 136 countries since 1910 finds 91.5% go over budget, over schedule or both, and fewer than 1% hit time, budget and promised benefits, with mean overrun 62% and a fat tail where a subset far exceed 50%.\n\nAltitude makes the tail legible. Global megaprojects run about $9tn a year; PIF at about $700bn would need two to six times its assets to fund NEOM at $1.6-4.5tn, while Brent crude at $61-66 sits below Saudi breakeven of $80-110, driving a large deficit in 2025. Hong Kong's reclamation cost against HK$400bn revenue sits beside a HK$100bn deficit. The base rate does not predict these projects will fail at the same rate — space and floating structures have no historical analogues — but it is the filter any new rendering should be held against.","receipts_markdown":"**How this piece is framed:** The stress-test tour: nine seriously-backed megastructures as nine tests of what it takes to build at civilization scale — what each was designed to solve, how far it actually got (paper / prototype / stalled-shelved / suspended / actively rising), and which bottleneck stopped it (physics-material that does not exist at scale vs money-politics-ecology), with the economics base-rate as the lens.\n\n**Charts & tables** — _AI-assisted; provenance on each line_\n- Where nine civilization-scale projects stand today — from claims clm_7d104231a9, clm_8dfa937bc2, clm_7138d89977, clm_ca94503284, clm_9beba87ccf, clm_ad87d3ad7c, clm_de3f9bb1a7, clm_62b40b0312, clm_296e0458fc, clm_f6d993b699, clm_187af0c50e, clm_50b3802c99, clm_1004f845bb, clm_53a791cd23, clm_8f7eb085c3, clm_dade68b877, clm_d80eb12a88, clm_aa054eab62, clm_e13b9b3079 · as of 2026-09-23\n\n**Visuals not shipped** — _planned but not fulfilled_\n- The material gap: 12 times too weak for a space elevator (req_mega_material_02): soft_cap_skipped — The 'material does not exist at scale' verdict is asserted for both pyramid and elevator but reader has no sense of gap size. A bar comparison makes the 12x order-of-magnitude barrier instantly legible - not a close miss.\n\n**Sources**\n- (primary) Human rights experts alarmed over 'imminent executions' in Saudi Arabia — United Nations — https://news.un.org/en/story/2023/05/1136322  ·  _read in full · captured 2026-09-23_\n- (primary) Improvement of the tensile strength of carbon nanotube fibers to 12.5 GPa by fluidics-induced alignment and densification — Nature Communications — https://www.nature.com/articles/s41467-026-75150-1  ·  _read in full · captured 2026-09-23_\n- (primary) UN-Habitat and partners unveil Oceanix Busan - world's first prototype floating city — https://www.preventionweb.net/news/un-habitat-and-partners-unveil-oceanix-busan-worlds-first-prototype-floating-city  ·  _read in full · captured 2026-09-23_\n- (primary) Perseverance brought 3 Greenpeace projects to fruition – A look back at 2021 — https://www.greenpeace.org/eastasia/blog/7237/perseverance-brought-3-greenpeace-projects-to-fruition-a-look-back-at-2021  ·  _read in full · captured 2026-09-23_\n- (primary) The Space Elevator Construction Concept — Obayashi Corporation — https://www.obayashi.co.jp/en/thinking/detail/space_elevator.html  ·  _read in full · captured 2026-09-23_\n- (secondary) Atlantropa: Herman Sörgel's Vision of a New Continent — Interesting Engineering — https://interestingengineering.com/innovation/atlantropa-herman-sorgels-vision-of-a-new-continent  ·  _read in full · captured 2026-09-23_\n- (secondary) Neom: Saudi Arabia jails nearly 50 tribespeople for resisting displacement (ALQST 'The Dark Side of Neom') — Middle East Eye — https://www.middleeasteye.net/news/saudi-arabia-neom-tribespeople-jailed-resisting-displacement  ·  _read in full · captured 2026-09-23_\n- (secondary) In 2004, Japanese engineers proposed a mile-high pyramid over Tokyo Bay — The Economic Times — https://m.economictimes.com/news/international/us/in-2004-japanese-engineers-proposed-a-mile-high-pyramid-over-tokyo-bay-14-times-taller-than-the-great-pyramid-meant-to-house-a-million-people-a-mega-city-we-still-cannot-build/articleshow/132511163.cms  ·  _read in full · captured 2026-09-23_\n- (secondary) World's Tallest Skyscraper Hits Major New Construction Milestone — Newsweek — https://www.newsweek.com/jeddah-tower-worlds-tallest-skyscraper-construction-milestone-12401838  ·  _read in full · captured 2026-09-23_\n- (secondary) Green group calls on Hong Kong government to cut back on Lantau reclamation project — SCMP — https://www.scmp.com/news/hong-kong/health-environment/article/2088244/green-group-calls-hong-kong-government-consider  ·  _read in full · captured 2026-09-23_\n- (secondary) Hong Kong shelves controversial Lantau reclamation; ‘necessary conditions’ missing — South China Morning Post — https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3325023/hong-kong-government-lacks-necessary-conditions-lantau-reclamation-project  ·  _read in full · captured 2026-09-23_\n- (secondary) Saudi Arabia drops France's EDF from desert megacity project — RFI — https://www.rfi.fr/en/international/20250625-france-s-edf-exits-controversial-saudi-arabian-desert-megacity-project-neom  ·  _read in full · captured 2026-09-23_\n- (secondary) Can Hong Kong afford its planned artificial island construction project? — GlobalVoices — https://globalvoices.org/2023/06/29/can-hong-kong-afford-its-planned-artificial-island-construction-project  ·  _read in full · captured 2026-09-23_\n- (secondary) Neom: Saudi forces 'told to kill' to clear land for eco-city — BBC — https://www.bbc.co.uk/news/world-middle-east-68945445  ·  _read in full · captured 2026-09-23_\n- (secondary) End of the Line? Saudi Arabia ‘forced to scale back’ plans for desert megacity — The Guardian — https://www.theguardian.com/world/2024/apr/10/the-line-saudi-arabia-scaling-back-plans-105-mile-long-desert-megacity-crown-prince  ·  _read in full · captured 2026-09-23_\n- (secondary) A vision of the future? We can't take our eyes off Shimizu Corporation's Ocean Spiral design — SoraNews24 — https://soranews24.com/2014/11/21/a-vision-of-the-future-we-cant-take-our-eyes-off-shimizu-corporations-ocean-spiral-design  ·  _read in full · captured 2026-09-23_\n- (secondary) Hong Kong: Built on Borrowed Sea — ArcGIS — https://storymaps.arcgis.com/stories/21fec0579dc14460961189214845a1ff  ·  _read in full · captured 2026-09-23_\n- (secondary) Saudi Fiscal Breakeven Oil Price 2026: $80-85 Estimate — Vision2030.ai — https://vision2030.ai/encyclopedia/oil-price-impact-saudi-economy  ·  _read in full · captured 2026-09-23_\n- (secondary) Halt Lantau reclamation plan or risk Northern Metropolis bids: Hong Kong developers — SCMP — https://www.scmp.com/news/hong-kong/society/article/3314820/halt-lantau-reclamation-or-risk-northern-metropolis-bids-hong-kong-developers  ·  _read in full · captured 2026-09-23_\n- (secondary) Staff at France's EDF question involvement in futuristic Saudi city — RFI — https://www.rfi.fr/en/international/20240408-staff-at-france-s-edf-question-involvement-in-futuristic-saudi-city-neom-energy-electricity  ·  _read in full · captured 2026-09-23_\n- (secondary) Why do large projects go over budget? — Strategy+Business — https://www.strategy-business.com/article/Why-do-large-projects-go-over-budget  ·  _read in full · captured 2026-09-23_\n- (secondary) How Saudi Arabia's futuristic megacity will progress in 2026 — Newsweek — https://www.newsweek.com/how-saudi-arabias-futuristic-megacity-will-progress-in-2026-11244377  ·  _read in full · captured 2026-09-23_\n- (secondary) Slow down on Hong Kong's less-urgent public projects to save money: lawmakers — SCMP — https://www.scmp.com/news/hong-kong/society/article/3293646/slow-down-hong-kongs-less-urgent-public-projects-save-money-lawmakers  ·  _read in full · captured 2026-09-23_\n- (secondary) A Japanese company is about to test a tiny space elevator in space — Phys.org — https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html  ·  _full text not obtained — used its summary_\n- (secondary) HK lacks 'necessary conditions' to start islands reclamation project: minister — Hong Kong Free Press — https://hongkongfp.com/2025/09/11/hong-kong-lacks-necessary-conditions-to-start-controversial-lantau-reclamation-project-minister-says  ·  _full text not obtained — used its summary_\n- (secondary) Price tag for artificial islands off Hong Kong's Lantau balloons to HK$580 billion — South China Morning Post — https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3204037/authorities-raise-price-tag-artificial-islands-hong-kongs-lantau-hk580-billion  ·  _full text not obtained — used its summary_\n\n**Claims, and how far we tracked each down**\n- _[confirmed]_ Shimizu Mega-City Pyramid (TRY 2004) is a proposed 2,004m (2km, 6,575ft) tall pyramid over Tokyo Bay, about 14 times the height of the Great Pyramid of Giza and ~2.5x the Burj Khalifa.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ The pyramid is designed to house 750,000 to 1,000,000 people and would be the largest man-made structure on Earth if built.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Shimizu's pyramid cannot be built with conventional steel/concrete; it depends on future mass-produced carbon-nanotube and graphene materials whose real-world tensile strength (11-120 GPa in lab) remains far below theoretical ~200 GPa due to defects.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Shimizu Ocean Spiral is Shimizu Corporation's third Dream Series concept (announced Nov 2014) developed over 2 years with Tokyo University, Saga University and JAMSTEC.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Ocean Spiral consists of a 500m-diameter (1,640ft) floating sphere (Blue Garden) housing 5,000 people over 75 floors, stabilized by buoyancy-gravity balance and able to fully submerge in tsunami/typhoon, connected by a 15km spiral tube descending 3,000-4,000m to a seabed resource plant.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Shimizu estimated Ocean Spiral would cost over 3 trillion yen (US$25.4bn), take 5 years to build, with technology ready between 2030-2050.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Obayashi Corporation announced in 2012 a space elevator to be built by 2050, comprising a 96,000km carbon-nanotube cable, a 400m-diameter floating Earth Port, and a 12,500-ton counterweight, with capacity for 100-ton climbers.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Obayashi's own simulation concludes construction is technically feasible only with assumed cable tensile strength of 150 GPa, requiring ~20 years to build the cable (initial 20-ton cable reinforced 510 times to 7,000 tons over ~18 years, plus 1 year for facilities), with small wind/Coriolis effects and need for ground pre-tension.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ No material at required scale/strength exists today; carbon nanotubes have theoretical breaking length ~5,000-6,000km but real production cannot make defect-free continuous 96,000km ribbon; diamond nanofilament proposed but also not scalable.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ A first tether-climber test (STARS-Me, Shizuoka University + Obayashi) flew in 2018: two 10cm CubeSats with 10m tether and matchbox-sized motorized climber, the first climber movement on a tether in space.  ·  from a source summary — we did not read the full source\n- _[confirmed]_ Saudi Arabia's The Line at NEOM is designed as a pair of parallel mirrored walls 170km long, 500m high, 200m wide, enclosing 34km2, planned for 9 million residents at density ~265,000/km2 (10x Manhattan).  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ The Line is part of NEOM (26,000km2 in Tabuk Province), centrepiece of Crown Prince Mohammed bin Salman's Vision 2030 to diversify from oil, backed by the Public Investment Fund (PIF) with initial $500bn commitment; internal estimates rose to $1.6tn (2021) then ~$4.5tn (2022).  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ The Line has been scaled back: Bloomberg-reported documents indicate the 2030 target cut from 1.5 million people over 16km (20 modules) to ~300,000 people in a 2.4km (1.5-mile) segment; at least one contractor dismissed workers.  ·  read in full (as of 2026-09-23)\n- _[likely]_ By late 2025 construction on The Line was effectively suspended: Hyundai E&C cancelled SAR 6.16bn (~$1.6bn) tunnel contract, workforce cut ~35% with 1,000+ employees relocated to Riyadh, CEO Nadhmi Al-Nasr departed Nov 2024, and 2029 Asian Winter Games reassigned from Trojena (Feb 2026).  ·  read in full (as of 2026-09-23)\n- _[likely]_ Construction on The Line began July 2023 with large earthworks; by Oct 2024 NEOM reported a SAR 700m concrete factory (20,000 m3/day) and ~1,000 of 30,000+ foundation piles placed, with 120 piles/week; PIF reported 115,000 workers/contractors, 100+ sites, 20M m3 earth excavated in 2024.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Oceanix Busan is billed as the world's first prototype floating city, developed by Oceanix (NY blue-tech, founded 2018) with UN-Habitat and Busan Metropolitan City, designed by BIG-Bjarke Ingels Group and SAMOO (Samsung) with Arup, Bouygues, MIT Center for Ocean Engineering.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Oceanix Busan initial phase is 6.3 hectares (15.5 acres) of three interconnected hexagonal platforms (living/research/lodging) for 12,000 residents, expandable to 20+ platforms for up to 100,000, linked to land by bridges, with net-zero energy (floating/rooftop PV), closed-loop water, waste, food, and habitat regeneration.  ·  read in full (as of 2026-09-23)\n- _[likely]_ Oceanix Busan was unveiled at UN Headquarters April 2022; construction was slated to begin 2023 with completion 2025-2028 tied to Busan's Expo 2030 bid; UN-Habitat said in May 2024 it was being implemented off Busan's North Port, but no full city is yet operational and broader scaling remains uncertain due to cost/regulation.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Hong Kong's Lantau Tomorrow Vision (now Kau Yi Chau Artificial Islands) proposes 1,700 hectares of reclamation (1,000 ha at Kau Yi Chau plus Sunny Bay/Lung Kwu Tan) to create a third central business district with 190,000-210,000 flats for 550,000 people and 4M sqm office space.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Lantau Tomorrow Vision was announced by Chief Executive Carrie Lam in Oct 2018 with initial estimate HK$624bn (US$80bn) including HK$273bn transport network (56km roads/rail); cost later revised to HK$580bn (US$74.6bn).  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Hong Kong government has shelved Lantau reclamation: Development Secretary Bernadette Linn stated Sept 2025 the government lacks 'necessary conditions' to start within the current term, halting environmental assessment and prioritizing the 30,000-hectare Northern Metropolis near the mainland border; first population intake originally 2032, reclamation start delayed from 2025 to 2027 then indefinite.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Jeddah Tower (Kingdom Tower) in Jeddah Economic City is designed by Adrian Smith + Gordon Gill Architecture to exceed 1,000m (1,008m/3,281ft, 167 floors, 530,000 sqm), the first building over 1km, 170m taller than Burj Khalifa (828m, also by Smith at SOM).  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Jeddah Tower construction paused in 2018 for 7 years due to contractor/financing issues (Saudi Binladin Group, anti-corruption purge); Saudi Binladin Group rehired late 2024 on SR7.2bn ($2bn) contract, Turner Construction took project management March 2025, and construction restarted Jan 2025 advancing ~1 floor per 3-4 days.  ·  read in full (as of 2026-09-23)\n- _[likely]_ As of late 2025 Jeddah Tower had reached 69-80 floors / 454m at 113 floors (reports vary by date), targeting 500m halfway mark and completion in 2028.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Bering Strait tunnel/bridge is a hypothetical 85-103km rail link between Chukotka (Russia) and Alaska (US) via the Diomede Islands, first dreamed by Tsar Nicholas II, revived periodically (2011 Russian plan, 2025 'Putin-Trump tunnel' floated by RDIF head Kirill Dmitriev to Elon Musk).  ·  from a source summary — we did not read the full source\n- _[likely]_ Bering Strait crossing has no construction, no financing, and cost estimates ranging from ~$8bn (optimistic) to $65bn+ (traditional), requiring thousands of km of connecting rail through permafrost with no existing infrastructure.  ·  from a source summary — we did not read the full source\n- _[confirmed]_ Atlantropa was German architect Hermann Sörgel's 1928 plan to dam the Strait of Gibraltar (14km at narrowest, dam planned 30km inside Med, 2.5km wide foundations, 300m high, crowned by 400m tower), plus dams at Sicily-Tunisia and Dardanelles, to lower the Mediterranean 100m (west) to 200m (east), draining one-fifth of the sea.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Atlantropa would have created 576,000 km2 of new land, generated 110,000 MW hydroelectricity (claimed 50% of Europe's needs at the time), and taken 100-150 years with 200,000 workers, uniting Europe and Africa into one continent; it was never built, rejected by Nazi regime and later made obsolete by nuclear power, decolonization and cost.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Megaproject economics: Bent Flyvbjerg's database of >16,000 projects in 136 countries since 1910 finds 91.5% go over budget, over schedule, or both; <1% are on time, on budget and deliver promised benefits; mean cost overrun 62% with fat-tail risk.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Specific overruns: Channel Tunnel 80%, Denver International Airport 200%, Boston Big Dig 220%, Sydney Opera House 1,400%, James Webb Space Telescope 450%; 18% of IT projects overrun >50% with average 447% for that subset; nuclear plants and hydro dams have highest overruns and fattest tails.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Obayashi's own simulation concludes space elevator (96,000-km CNT cable, 400-m floating Earth Port, 12,500-ton counterweight, 100-ton climbers) is technically feasible only with assumed cable tensile strength of 150 GPa, taking roughly 20 years (20-ton seed cable reinforced 510 times to 7,000 tons over ~18 years + 1 year for facilities), with small wind/Coriolis effects and requirement to fix cable to Earth's surface with pre-tension; page states 'current technology levels are not yet sufficient to realize the concept, but our plan is realistic, and is a stepping stone.'  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Saudi authorities forcibly displaced Howeitat tribe members for NEOM/The Line: at least 47 arrested/detained per ALQST Feb 2023 'The Dark Side of Neom' (5 sentenced to death, 15 to 15-50 years, 19 detained with no information, 8 released); BBC reports >6,000 moved per government, ALQST estimates higher; satellite analysis shows villages al-Khuraybah, Sharma, Gayal demolished (homes/schools/hospitals wiped).  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ UN Human Rights Council independent experts (May 2023) said Howeitat evictions since Jan 2020 in three villages amount to forced evictions prohibited under international law (violation of right to adequate housing, freedom of expression, access to information), charged under 'overly vague' 2017 anti-terror law, with allegations of torture to extract confessions; three men sentenced to death 5 Aug 2022 (appeal 23 Jan 2023) and three to 27/35/50 years, not meeting 'most serious crimes' threshold for death penalty.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ BBC May 2024 investigation: ex-intelligence officer Col Rabih Alenezi testified he was ordered April 2020 to evict al-Khuraybah and that order stated Huwaitat were 'many rebels' and 'whoever continues to resist [eviction] should be killed' — licensing lethal force; Abdul Rahim al-Huwaiti was shot dead 13 April 2020 after refusing land valuation and posting protest videos (state claimed he opened fire; UN/NGOs say killed for resisting).  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ EDF staff dissent: 73% of respondents in late-2022 FO union survey in hydro-engineering department opposed NEOM, saying it was contrary to EDF's ethical charter and net-zero 2050 commitment; staff argued Nestor pumped-hydro would be carbon-free but building NEOM would generate ~1.8 gigatonnes CO2 (4x UK annual emissions per UNSW estimate cited by Radio France); union sought right to withdraw for environmental/ethical reasons.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ EDF contract terminated: Saudi authorities informed EDF March 2025 they no longer required Nestor hydro plant, opting for PV/wind/batteries for scaled-down NEOM; RFI notes The Line reduced to 2.4km as cost exploded from $500bn to $8.8tn estimate (Bloomberg); staff at La Motte-Servolex (30-40 employees, 3-4 years work) described abrupt stop as 'violent and depressing' while others called abandonment 'good news.'  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Lantau/Kau Yi Chau environmental coalition opposition: 15 green groups released joint statement Nov 2021 urging Environmental Protection Department to reject rushed Lantau EIA (only two working days before press conference); Green Earth submission to LegCo warned reclamation would destroy Chinese white dolphin habitat (Grade 1 national protected animal) and require massive marine sand mining destroying river/sea beds; StoryMaps documents Lantau waters dolphin collapse from 188 in 2003 to 3-4 after airport reclamation, with 25% of Hong Kong coastline already reclaimed.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Lantau fiscal deficit critique: reclamation alone HK$580bn ($74bn) per government, veteran engineer Jason Poon estimates HK$900bn ($115bn) with infrastructure vs HK$400bn ($51bn) land-sale revenue = HK$500bn deficit; economist Andy Kwan warns fiscal reserves could be drained in a decade; Legislative Council lawmakers Jan 2025 urged delaying less-urgent projects to tackle ~HK$100bn deficit (double budget projection, similar to HK$101.6bn 2023-24); Real Estate Developers Association (Louis Loong) said government cannot support Lantau and Northern Metropolis concurrently and should permanently halt Lantau to avoid depressing Northern Metropolis land bids.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Atlantropa ecological/colonial critique: plan to lower Mediterranean 100m (west) to 200m (east) and expose 576,000 km2 would strand Venice/Genoa inland, increase Levant landmass 50%, disrupt salinity and climate (evaporative basin cut off from Atlantic), and was rejected as Eurocentric expansionism; Italians never supported it due to coastline dependence, Nazis ridiculed it as anti-Eurasian, and post-war nuclear power/decolonization rendered it technologically unnecessary and politically unfeasible.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Carbon-nanotube scalability skepticism quantified: best 2026 fluidics-aligned fiber achieves 12.5 GPa tensile strength (7.5 N/tex, 370 GPa modulus) approaching lower limit of individual CNTs (13-80 GPa), but still ~12x below Obayashi's required 150 GPa for 96,000km ribbon; paper notes macroscopic fibers to date exhibit only fraction of individual CNT properties due to alignment/packing defects, and only 15% strain stretching is possible without deterioration — supporting 'material does not exist at scale' is order-of-magnitude barrier.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ Saudi fiscal oil-price sensitivity as structural blocker for NEOM: IMF/Oxford Economics breakeven $80-85/bbl vs Bloomberg $96 and all-in (incl. PIF domestic spending) >$110; Brent fell to $61-66 late 2025 (IMF baseline $66.94 for 2025, $62.38 for 2026) driving 2025 deficit ~SAR245bn (5.3% GDP) and Q1 2026 deficit SAR125.7bn ($33.5bn, largest since 2020) despite non-oil revenue SAR116.3bn; 2026 budget assumes deficit SAR165bn (3.3% GDP) at high-$60s/low-$70s oil, with public debt SAR1,457bn (31.7% GDP) end-2025 rising to SAR1,622bn (32.7%) end-2026.  ·  read in full (as of 2026-09-23)\n- _[confirmed]_ NEOM safety/engineering critique beyond wind/seismic: RFI citing WSJ/FT reports 100,000+ workers in area size of Belgium, overcrowded camps, inadequate infrastructure, absence of comprehensive emergency plan (2022 independent reports), and five fatal accidents in Nov 2024 at work sites/roads; new acting CEO Aiman al-Mudaifer launched comprehensive review in 'environment of limited resources' amid falling oil prices.  ·  read in full (as of 2026-09-23)\n- _[contested]_ Oceanix regulatory/insurance vacuum and cost critique: no evidence of operational habitation beyond prototype design (6.3ha/12,000 residents) despite UN-Habitat May 2024 'being implemented' claim; profile's own gap notes no independent peer review of 3-4km spiral tube pressure design and no Korean legal framework for floating habitation/insurance; GlobalVoices base rate (46% incomplete, 77% for >1,000ha) implies floating-city scaling faces same fiscal/regulatory fat-tail as Lantau.  ·  read in full (as of 2026-09-23)\n\n**Where we hit a limit / what to double-check**\n- We did not obtain the full text of **A Japanese company is about to test a tiny space elevator in space** (https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html); claims resting on it are from its summary — you may be able to reach it directly.\n- We did not obtain the full text of **HK lacks 'necessary conditions' to start islands reclamation project: minister** (https://hongkongfp.com/2025/09/11/hong-kong-lacks-necessary-conditions-to-start-controversial-lantau-reclamation-project-minister-says); claims resting on it are from its summary — you may be able to reach it directly.\n- We did not obtain the full text of **Price tag for artificial islands off Hong Kong's Lantau balloons to HK$580 billion** (https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3204037/authorities-raise-price-tag-artificial-islands-hong-kongs-lantau-hk580-billion); claims resting on it are from its summary — you may be able to reach it directly.","claims":[{"contradicted_by":[],"grade":"confirmed","id":"clm_7d104231a9","salience":"high","sources":[{"published_at":"2026-07-20","publisher":"The Economic Times","title":"In 2004, Japanese engineers proposed a mile-high pyramid over Tokyo Bay","url":"https://m.economictimes.com/news/international/us/in-2004-japanese-engineers-proposed-a-mile-high-pyramid-over-tokyo-bay-14-times-taller-than-the-great-pyramid-meant-to-house-a-million-people-a-mega-city-we-still-cannot-build/articleshow/132511163.cms"}],"text":"Shimizu Mega-City Pyramid (TRY 2004) is a proposed 2,004m (2km, 6,575ft) tall pyramid over Tokyo Bay, about 14 times the height of the Great Pyramid of Giza and ~2.5x the Burj Khalifa."},{"contradicted_by":[],"grade":"confirmed","id":"clm_8dfa937bc2","salience":"high","sources":[{"published_at":"2026-07-20","publisher":"The Economic Times","title":"In 2004, Japanese engineers proposed a mile-high pyramid over Tokyo Bay","url":"https://m.economictimes.com/news/international/us/in-2004-japanese-engineers-proposed-a-mile-high-pyramid-over-tokyo-bay-14-times-taller-than-the-great-pyramid-meant-to-house-a-million-people-a-mega-city-we-still-cannot-build/articleshow/132511163.cms"}],"text":"The pyramid is designed to house 750,000 to 1,000,000 people and would be the largest man-made structure on Earth if built."},{"contradicted_by":[],"grade":"likely","id":"clm_254eb63995","salience":"medium","sources":[{"published_at":"2026-07-20","publisher":"The Economic Times","title":"In 2004, Japanese engineers proposed a mile-high pyramid over Tokyo Bay","url":"https://m.economictimes.com/news/international/us/in-2004-japanese-engineers-proposed-a-mile-high-pyramid-over-tokyo-bay-14-times-taller-than-the-great-pyramid-meant-to-house-a-million-people-a-mega-city-we-still-cannot-build/articleshow/132511163.cms"}],"text":"The pyramid's structural concept is an open lattice of megatrusses supporting 36 engineered concrete piers, with 24+ 30-storey skyscrapers suspended inside by cables and connected by moving walkways/tilted elevators/pods; trusses would be clad in solar film plus algae power and designed to flex in earthquakes/wind/tsunami."},{"contradicted_by":[],"grade":"confirmed","id":"clm_807d61ca82","salience":"high","sources":[{"published_at":"2026-07-20","publisher":"The Economic Times","title":"In 2004, Japanese engineers proposed a mile-high pyramid over Tokyo Bay","url":"https://m.economictimes.com/news/international/us/in-2004-japanese-engineers-proposed-a-mile-high-pyramid-over-tokyo-bay-14-times-taller-than-the-great-pyramid-meant-to-house-a-million-people-a-mega-city-we-still-cannot-build/articleshow/132511163.cms"}],"text":"Shimizu's pyramid cannot be built with conventional steel/concrete; it depends on future mass-produced carbon-nanotube and graphene materials whose real-world tensile strength (11-120 GPa in lab) remains far below theoretical ~200 GPa due to defects."},{"contradicted_by":[],"grade":"likely","id":"clm_914d40d9c9","salience":"medium","sources":[{"published_at":"2026-07-20","publisher":"The Economic Times","title":"In 2004, Japanese engineers proposed a mile-high pyramid over Tokyo Bay","url":"https://m.economictimes.com/news/international/us/in-2004-japanese-engineers-proposed-a-mile-high-pyramid-over-tokyo-bay-14-times-taller-than-the-great-pyramid-meant-to-house-a-million-people-a-mega-city-we-still-cannot-build/articleshow/132511163.cms"}],"text":"Shimizu has stated construction could begin as early as 2030 with completion around 2110 (80-year build); the project remains a paper thought-experiment with patents filed from 1992, inspired by Blade Runner (1982)."},{"contradicted_by":[],"grade":"confirmed","id":"clm_7138d89977","salience":"high","sources":[{"published_at":"2014-11-21","publisher":"SoraNews24","title":"A vision of the future? We can't take our eyes off Shimizu Corporation's Ocean Spiral design","url":"https://soranews24.com/2014/11/21/a-vision-of-the-future-we-cant-take-our-eyes-off-shimizu-corporations-ocean-spiral-design"}],"text":"Shimizu Ocean Spiral is Shimizu Corporation's third Dream Series concept (announced Nov 2014) developed over 2 years with Tokyo University, Saga University and JAMSTEC."},{"contradicted_by":[],"grade":"confirmed","id":"clm_ca94503284","salience":"high","sources":[{"published_at":"2014-11-21","publisher":"SoraNews24","title":"A vision of the future? We can't take our eyes off Shimizu Corporation's Ocean Spiral design","url":"https://soranews24.com/2014/11/21/a-vision-of-the-future-we-cant-take-our-eyes-off-shimizu-corporations-ocean-spiral-design"}],"text":"Ocean Spiral consists of a 500m-diameter (1,640ft) floating sphere (Blue Garden) housing 5,000 people over 75 floors, stabilized by buoyancy-gravity balance and able to fully submerge in tsunami/typhoon, connected by a 15km spiral tube descending 3,000-4,000m to a seabed resource plant."},{"contradicted_by":[],"grade":"likely","id":"clm_e72a8a3b93","salience":"medium","sources":[{"published_at":"2014-11-21","publisher":"SoraNews24","title":"A vision of the future? We can't take our eyes off Shimizu Corporation's Ocean Spiral design","url":"https://soranews24.com/2014/11/21/a-vision-of-the-future-we-cant-take-our-eyes-off-shimizu-corporations-ocean-spiral-design"}],"text":"Ocean Spiral would also include deep-sea fish farms, seawater desalination, and seabed mineral mining via the Earth Factory; energy would be generated from the seabed."},{"contradicted_by":[],"grade":"confirmed","id":"clm_1af0ba5a54","salience":"high","sources":[{"published_at":"2014-11-21","publisher":"SoraNews24","title":"A vision of the future? We can't take our eyes off Shimizu Corporation's Ocean Spiral design","url":"https://soranews24.com/2014/11/21/a-vision-of-the-future-we-cant-take-our-eyes-off-shimizu-corporations-ocean-spiral-design"}],"text":"Shimizu estimated Ocean Spiral would cost over 3 trillion yen (US$25.4bn), take 5 years to build, with technology ready between 2030-2050."},{"contradicted_by":[],"grade":"confirmed","id":"clm_9beba87ccf","salience":"high","sources":[{"published_at":"2026-03-29","publisher":"Obayashi Corporation","title":"The Space Elevator Construction Concept","url":"https://www.obayashi.co.jp/en/thinking/detail/space_elevator.html"}],"text":"Obayashi Corporation announced in 2012 a space elevator to be built by 2050, comprising a 96,000km carbon-nanotube cable, a 400m-diameter floating Earth Port, and a 12,500-ton counterweight, with capacity for 100-ton climbers."},{"contradicted_by":[],"grade":"likely","id":"clm_8e5dd51888","salience":"medium","sources":[{"published_at":"2026-03-29","publisher":"Obayashi Corporation","title":"The Space Elevator Construction Concept","url":"https://www.obayashi.co.jp/en/thinking/detail/space_elevator.html"},{"published_at":"2018-09-11","publisher":"Phys.org","title":"A Japanese company is about to test a tiny space elevator in space","url":"https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html"}],"text":"Obayashi's concept includes stations at Low Earth Orbit Gate, Geostationary Orbit (36,000km), Mars Gate and Solar System Exploration Gate; climbers would ascend at ~200 km/h carrying ~30 passengers, taking about a week to GEO."},{"contradicted_by":[],"grade":"confirmed","id":"clm_ad87d3ad7c","salience":"high","sources":[{"published_at":"2026-03-29","publisher":"Obayashi Corporation","title":"The Space Elevator Construction Concept","url":"https://www.obayashi.co.jp/en/thinking/detail/space_elevator.html"}],"text":"Obayashi's own simulation concludes construction is technically feasible only with assumed cable tensile strength of 150 GPa, requiring ~20 years to build the cable (initial 20-ton cable reinforced 510 times to 7,000 tons over ~18 years, plus 1 year for facilities), with small wind/Coriolis effects and need for ground pre-tension."},{"contradicted_by":[],"grade":"confirmed","id":"clm_ea9fefec0a","salience":"high","sources":[{"published_at":"2018-09-11","publisher":"Phys.org","title":"A Japanese company is about to test a tiny space elevator in space","url":"https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html"},{"published_at":"2026-03-29","publisher":"Obayashi Corporation","title":"The Space Elevator Construction Concept","url":"https://www.obayashi.co.jp/en/thinking/detail/space_elevator.html"}],"text":"No material at required scale/strength exists today; carbon nanotubes have theoretical breaking length ~5,000-6,000km but real production cannot make defect-free continuous 96,000km ribbon; diamond nanofilament proposed but also not scalable."},{"contradicted_by":[],"grade":"confirmed","id":"clm_707cfbe945","salience":"medium","sources":[{"published_at":"2018-09-11","publisher":"Phys.org","title":"A Japanese company is about to test a tiny space elevator in space","url":"https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html"}],"text":"A first tether-climber test (STARS-Me, Shizuoka University + Obayashi) flew in 2018: two 10cm CubeSats with 10m tether and matchbox-sized motorized climber, the first climber movement on a tether in space."},{"contradicted_by":[],"grade":"confirmed","id":"clm_de3f9bb1a7","salience":"high","sources":[{"published_at":"2024-04-08","publisher":"RFI","title":"Staff at France's EDF question involvement in futuristic Saudi city","url":"https://www.rfi.fr/en/international/20240408-staff-at-france-s-edf-question-involvement-in-futuristic-saudi-city-neom-energy-electricity"},{"published_at":"2024-04-10","publisher":"The Guardian","title":"End of the Line? Saudi Arabia ‘forced to scale back’ plans for desert megacity","url":"https://www.theguardian.com/world/2024/apr/10/the-line-saudi-arabia-scaling-back-plans-105-mile-long-desert-megacity-crown-prince"}],"text":"Saudi Arabia's The Line at NEOM is designed as a pair of parallel mirrored walls 170km long, 500m high, 200m wide, enclosing 34km2, planned for 9 million residents at density ~265,000/km2 (10x Manhattan)."},{"contradicted_by":[],"grade":"confirmed","id":"clm_62b40b0312","salience":"high","sources":[{"published_at":"2024-04-10","publisher":"The Guardian","title":"End of the Line? Saudi Arabia ‘forced to scale back’ plans for desert megacity","url":"https://www.theguardian.com/world/2024/apr/10/the-line-saudi-arabia-scaling-back-plans-105-mile-long-desert-megacity-crown-prince"},{"published_at":"2026-01-02","publisher":"Newsweek","title":"How Saudi Arabia's futuristic megacity will progress in 2026","url":"https://www.newsweek.com/how-saudi-arabias-futuristic-megacity-will-progress-in-2026-11244377"}],"text":"The Line is part of NEOM (26,000km2 in Tabuk Province), centrepiece of Crown Prince Mohammed bin Salman's Vision 2030 to diversify from oil, backed by the Public Investment Fund (PIF) with initial $500bn commitment; internal estimates rose to $1.6tn (2021) then ~$4.5tn (2022)."},{"contradicted_by":[],"grade":"likely","id":"clm_76f421fd64","salience":"medium","sources":[{"published_at":"2026-01-02","publisher":"Newsweek","title":"How Saudi Arabia's futuristic megacity will progress in 2026","url":"https://www.newsweek.com/how-saudi-arabias-futuristic-megacity-will-progress-in-2026-11244377"}],"text":"Construction on The Line began July 2023 with large earthworks; by Oct 2024 NEOM reported a SAR 700m concrete factory (20,000 m3/day) and ~1,000 of 30,000+ foundation piles placed, with 120 piles/week; PIF reported 115,000 workers/contractors, 100+ sites, 20M m3 earth excavated in 2024."},{"contradicted_by":[],"grade":"confirmed","id":"clm_296e0458fc","salience":"high","sources":[{"published_at":"2024-04-10","publisher":"The Guardian","title":"End of the Line? Saudi Arabia ‘forced to scale back’ plans for desert megacity","url":"https://www.theguardian.com/world/2024/apr/10/the-line-saudi-arabia-scaling-back-plans-105-mile-long-desert-megacity-crown-prince"}],"text":"The Line has been scaled back: Bloomberg-reported documents indicate the 2030 target cut from 1.5 million people over 16km (20 modules) to ~300,000 people in a 2.4km (1.5-mile) segment; at least one contractor dismissed workers."},{"contradicted_by":[],"grade":"likely","id":"clm_f6d993b699","salience":"high","sources":[{"published_at":"2026-01-02","publisher":"Newsweek","title":"How Saudi Arabia's futuristic megacity will progress in 2026","url":"https://www.newsweek.com/how-saudi-arabias-futuristic-megacity-will-progress-in-2026-11244377"}],"text":"By late 2025 construction on The Line was effectively suspended: Hyundai E&C cancelled SAR 6.16bn (~$1.6bn) tunnel contract, workforce cut ~35% with 1,000+ employees relocated to Riyadh, CEO Nadhmi Al-Nasr departed Nov 2024, and 2029 Asian Winter Games reassigned from Trojena (Feb 2026)."},{"contradicted_by":[],"grade":"confirmed","id":"clm_187af0c50e","salience":"high","sources":[{"published_at":"2022-05-23","publisher":"UN-Habitat","title":"UN-Habitat and partners unveil Oceanix Busan - world's first prototype floating city","url":"https://www.preventionweb.net/news/un-habitat-and-partners-unveil-oceanix-busan-worlds-first-prototype-floating-city"}],"text":"Oceanix Busan is billed as the world's first prototype floating city, developed by Oceanix (NY blue-tech, founded 2018) with UN-Habitat and Busan Metropolitan City, designed by BIG-Bjarke Ingels Group and SAMOO (Samsung) with Arup, Bouygues, MIT Center for Ocean Engineering."},{"contradicted_by":[],"grade":"confirmed","id":"clm_50b3802c99","salience":"high","sources":[{"published_at":"2022-05-23","publisher":"UN-Habitat","title":"UN-Habitat and partners unveil Oceanix Busan - world's first prototype floating city","url":"https://www.preventionweb.net/news/un-habitat-and-partners-unveil-oceanix-busan-worlds-first-prototype-floating-city"}],"text":"Oceanix Busan initial phase is 6.3 hectares (15.5 acres) of three interconnected hexagonal platforms (living/research/lodging) for 12,000 residents, expandable to 20+ platforms for up to 100,000, linked to land by bridges, with net-zero energy (floating/rooftop PV), closed-loop water, waste, food, and habitat regeneration."},{"contradicted_by":[],"grade":"likely","id":"clm_dcdac1b71e","salience":"medium","sources":[{"published_at":"2022-05-23","publisher":"UN-Habitat","title":"UN-Habitat and partners unveil Oceanix Busan - world's first prototype floating city","url":"https://www.preventionweb.net/news/un-habitat-and-partners-unveil-oceanix-busan-worlds-first-prototype-floating-city"}],"text":"Oceanix Busan was unveiled at UN Headquarters April 2022; construction was slated to begin 2023 with completion 2025-2028 tied to Busan's Expo 2030 bid; UN-Habitat said in May 2024 it was being implemented off Busan's North Port, but no full city is yet operational and broader scaling remains uncertain due to cost/regulation."},{"contradicted_by":[],"grade":"confirmed","id":"clm_1004f845bb","salience":"high","sources":[{"published_at":"2025-09-10","publisher":"South China Morning Post","title":"Hong Kong shelves controversial Lantau reclamation; ‘necessary conditions’ missing","url":"https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3325023/hong-kong-government-lacks-necessary-conditions-lantau-reclamation-project"},{"published_at":"2022-12-20","publisher":"South China Morning Post","title":"Price tag for artificial islands off Hong Kong's Lantau balloons to HK$580 billion","url":"https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3204037/authorities-raise-price-tag-artificial-islands-hong-kongs-lantau-hk580-billion"}],"text":"Hong Kong's Lantau Tomorrow Vision (now Kau Yi Chau Artificial Islands) proposes 1,700 hectares of reclamation (1,000 ha at Kau Yi Chau plus Sunny Bay/Lung Kwu Tan) to create a third central business district with 190,000-210,000 flats for 550,000 people and 4M sqm office space."},{"contradicted_by":[],"grade":"confirmed","id":"clm_2f7173d110","salience":"high","sources":[{"published_at":"2022-12-20","publisher":"South China Morning Post","title":"Price tag for artificial islands off Hong Kong's Lantau balloons to HK$580 billion","url":"https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3204037/authorities-raise-price-tag-artificial-islands-hong-kongs-lantau-hk580-billion"},{"published_at":"2025-09-10","publisher":"South China Morning Post","title":"Hong Kong shelves controversial Lantau reclamation; ‘necessary conditions’ missing","url":"https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3325023/hong-kong-government-lacks-necessary-conditions-lantau-reclamation-project"}],"text":"Lantau Tomorrow Vision was announced by Chief Executive Carrie Lam in Oct 2018 with initial estimate HK$624bn (US$80bn) including HK$273bn transport network (56km roads/rail); cost later revised to HK$580bn (US$74.6bn)."},{"contradicted_by":[],"grade":"confirmed","id":"clm_53a791cd23","salience":"high","sources":[{"published_at":"2025-09-10","publisher":"South China Morning Post","title":"Hong Kong shelves controversial Lantau reclamation; ‘necessary conditions’ missing","url":"https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3325023/hong-kong-government-lacks-necessary-conditions-lantau-reclamation-project"},{"published_at":"2025-09-11","publisher":"Hong Kong Free Press","title":"HK lacks 'necessary conditions' to start islands reclamation project: minister","url":"https://hongkongfp.com/2025/09/11/hong-kong-lacks-necessary-conditions-to-start-controversial-lantau-reclamation-project-minister-says"}],"text":"Hong Kong government has shelved Lantau reclamation: Development Secretary Bernadette Linn stated Sept 2025 the government lacks 'necessary conditions' to start within the current term, halting environmental assessment and prioritizing the 30,000-hectare Northern Metropolis near the mainland border; first population intake originally 2032, reclamation start delayed from 2025 to 2027 then indefinite."},{"contradicted_by":[],"grade":"confirmed","id":"clm_8f7eb085c3","salience":"high","sources":[{"published_at":"2026-09-03","publisher":"Newsweek","title":"World's Tallest Skyscraper Hits Major New Construction Milestone","url":"https://www.newsweek.com/jeddah-tower-worlds-tallest-skyscraper-construction-milestone-12401838"}],"text":"Jeddah Tower (Kingdom Tower) in Jeddah Economic City is designed by Adrian Smith + Gordon Gill Architecture to exceed 1,000m (1,008m/3,281ft, 167 floors, 530,000 sqm), the first building over 1km, 170m taller than Burj Khalifa (828m, also by Smith at SOM)."},{"contradicted_by":[],"grade":"likely","id":"clm_b2de328c98","salience":"medium","sources":[{"published_at":"2026-09-03","publisher":"Newsweek","title":"World's Tallest Skyscraper Hits Major New Construction Milestone","url":"https://www.newsweek.com/jeddah-tower-worlds-tallest-skyscraper-construction-milestone-12401838"}],"text":"Jeddah Tower is centrepiece of a $20bn, 57M sq ft Jeddah Economic City district, with 7 hotel floors, 11 luxury apartment floors, offices, and world's highest observation deck at 660m."},{"contradicted_by":[],"grade":"confirmed","id":"clm_dade68b877","salience":"high","sources":[{"published_at":"2026-09-03","publisher":"Newsweek","title":"World's Tallest Skyscraper Hits Major New Construction Milestone","url":"https://www.newsweek.com/jeddah-tower-worlds-tallest-skyscraper-construction-milestone-12401838"}],"text":"Jeddah Tower construction paused in 2018 for 7 years due to contractor/financing issues (Saudi Binladin Group, anti-corruption purge); Saudi Binladin Group rehired late 2024 on SR7.2bn ($2bn) contract, Turner Construction took project management March 2025, and construction restarted Jan 2025 advancing ~1 floor per 3-4 days."},{"contradicted_by":[],"grade":"likely","id":"clm_e1a2efe015","salience":"medium","sources":[{"published_at":"2026-09-03","publisher":"Newsweek","title":"World's Tallest Skyscraper Hits Major New Construction Milestone","url":"https://www.newsweek.com/jeddah-tower-worlds-tallest-skyscraper-construction-milestone-12401838"}],"text":"As of late 2025 Jeddah Tower had reached 69-80 floors / 454m at 113 floors (reports vary by date), targeting 500m halfway mark and completion in 2028."},{"contradicted_by":[],"grade":"confirmed","id":"clm_d80eb12a88","salience":"high","sources":[{"published_at":"2018-09-11","publisher":"Phys.org","title":"A Japanese company is about to test a tiny space elevator in space","url":"https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html"}],"text":"Bering Strait tunnel/bridge is a hypothetical 85-103km rail link between Chukotka (Russia) and Alaska (US) via the Diomede Islands, first dreamed by Tsar Nicholas II, revived periodically (2011 Russian plan, 2025 'Putin-Trump tunnel' floated by RDIF head Kirill Dmitriev to Elon Musk)."},{"contradicted_by":[],"grade":"likely","id":"clm_b8188fa9d7","salience":"medium","sources":[{"published_at":"2018-09-11","publisher":"Phys.org","title":"A Japanese company is about to test a tiny space elevator in space","url":"https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html"}],"text":"Bering Strait crossing has no construction, no financing, and cost estimates ranging from ~$8bn (optimistic) to $65bn+ (traditional), requiring thousands of km of connecting rail through permafrost with no existing infrastructure."},{"contradicted_by":[],"grade":"confirmed","id":"clm_aa054eab62","salience":"high","sources":[{"published_at":"2018-08-19","publisher":"Interesting Engineering","title":"Atlantropa: Herman Sörgel's Vision of a New Continent","url":"https://interestingengineering.com/innovation/atlantropa-herman-sorgels-vision-of-a-new-continent"}],"text":"Atlantropa was German architect Hermann Sörgel's 1928 plan to dam the Strait of Gibraltar (14km at narrowest, dam planned 30km inside Med, 2.5km wide foundations, 300m high, crowned by 400m tower), plus dams at Sicily-Tunisia and Dardanelles, to lower the Mediterranean 100m (west) to 200m (east), draining one-fifth of the sea."},{"contradicted_by":[],"grade":"confirmed","id":"clm_e13b9b3079","salience":"high","sources":[{"published_at":"2018-08-19","publisher":"Interesting Engineering","title":"Atlantropa: Herman Sörgel's Vision of a New Continent","url":"https://interestingengineering.com/innovation/atlantropa-herman-sorgels-vision-of-a-new-continent"}],"text":"Atlantropa would have created 576,000 km2 of new land, generated 110,000 MW hydroelectricity (claimed 50% of Europe's needs at the time), and taken 100-150 years with 200,000 workers, uniting Europe and Africa into one continent; it was never built, rejected by Nazi regime and later made obsolete by nuclear power, decolonization and cost."},{"contradicted_by":[],"grade":"likely","id":"clm_2584a46612","salience":"low","sources":[{"published_at":"2018-08-19","publisher":"Interesting Engineering","title":"Atlantropa: Herman Sörgel's Vision of a New Continent","url":"https://interestingengineering.com/innovation/atlantropa-herman-sorgels-vision-of-a-new-continent"}],"text":"Sörgel promoted Atlantropa until his death in 1952 (struck by car on straight road, driver never found, murder speculation); Atlantropa Institute survived until 1960s."},{"contradicted_by":[],"grade":"confirmed","id":"clm_de3a579f3d","salience":"high","sources":[{"published_at":"2023-06-19","publisher":"Strategy+Business","title":"Why do large projects go over budget?","url":"https://www.strategy-business.com/article/Why-do-large-projects-go-over-budget"}],"text":"Megaproject economics: Bent Flyvbjerg's database of >16,000 projects in 136 countries since 1910 finds 91.5% go over budget, over schedule, or both; <1% are on time, on budget and deliver promised benefits; mean cost overrun 62% with fat-tail risk."},{"contradicted_by":[],"grade":"confirmed","id":"clm_eb82ff1dac","salience":"high","sources":[{"published_at":"2023-06-19","publisher":"Strategy+Business","title":"Why do large projects go over budget?","url":"https://www.strategy-business.com/article/Why-do-large-projects-go-over-budget"}],"text":"Specific overruns: Channel Tunnel 80%, Denver International Airport 200%, Boston Big Dig 220%, Sydney Opera House 1,400%, James Webb Space Telescope 450%; 18% of IT projects overrun >50% with average 447% for that subset; nuclear plants and hydro dams have highest overruns and fattest tails."},{"contradicted_by":[],"grade":"confirmed","id":"clm_b1fc15ea20","salience":"medium","sources":[{"published_at":"2023-06-19","publisher":"Strategy+Business","title":"Why do large projects go over budget?","url":"https://www.strategy-business.com/article/Why-do-large-projects-go-over-budget"}],"text":"Flyvbjerg defines megaprojects as >US$1bn; failure drivers include optimism bias, strategic misrepresentation, and sunk-cost lock-in ('start digging a hole so big there's no alternative')."},{"contradicted_by":[],"grade":"confirmed","id":"clm_acda15f7f1","salience":"high","sources":[{"published_at":"2026-03-29","publisher":"Obayashi Corporation","title":"The Space Elevator Construction Concept","url":"https://www.obayashi.co.jp/en/thinking/detail/space_elevator.html"}],"text":"Obayashi's own simulation concludes space elevator (96,000-km CNT cable, 400-m floating Earth Port, 12,500-ton counterweight, 100-ton climbers) is technically feasible only with assumed cable tensile strength of 150 GPa, taking roughly 20 years (20-ton seed cable reinforced 510 times to 7,000 tons over ~18 years + 1 year for facilities), with small wind/Coriolis effects and requirement to fix cable to Earth's surface with pre-tension; page states 'current technology levels are not yet sufficient to realize the concept, but our plan is realistic, and is a stepping stone.'"},{"contradicted_by":[],"grade":"confirmed","id":"clm_0eaa594223","salience":"high","sources":[{"published_at":"2024-05-09","publisher":"BBC","title":"Neom: Saudi forces 'told to kill' to clear land for eco-city","url":"https://www.bbc.co.uk/news/world-middle-east-68945445"},{"published_at":"2023-02-16","publisher":"Middle East Eye","title":"Neom: Saudi Arabia jails nearly 50 tribespeople for resisting displacement (ALQST 'The Dark Side of Neom')","url":"https://www.middleeasteye.net/news/saudi-arabia-neom-tribespeople-jailed-resisting-displacement"}],"text":"Saudi authorities forcibly displaced Howeitat tribe members for NEOM/The Line: at least 47 arrested/detained per ALQST Feb 2023 'The Dark Side of Neom' (5 sentenced to death, 15 to 15-50 years, 19 detained with no information, 8 released); BBC reports >6,000 moved per government, ALQST estimates higher; satellite analysis shows villages al-Khuraybah, Sharma, Gayal demolished (homes/schools/hospitals wiped)."},{"contradicted_by":[],"grade":"confirmed","id":"clm_f5e4d9f3fd","salience":"high","sources":[{"published_at":"2023-05-03","publisher":"United Nations","title":"Human rights experts alarmed over 'imminent executions' in Saudi Arabia","url":"https://news.un.org/en/story/2023/05/1136322"}],"text":"UN Human Rights Council independent experts (May 2023) said Howeitat evictions since Jan 2020 in three villages amount to forced evictions prohibited under international law (violation of right to adequate housing, freedom of expression, access to information), charged under 'overly vague' 2017 anti-terror law, with allegations of torture to extract confessions; three men sentenced to death 5 Aug 2022 (appeal 23 Jan 2023) and three to 27/35/50 years, not meeting 'most serious crimes' threshold for death penalty."},{"contradicted_by":[],"grade":"confirmed","id":"clm_ae076b5dc1","salience":"high","sources":[{"published_at":"2024-05-09","publisher":"BBC","title":"Neom: Saudi forces 'told to kill' to clear land for eco-city","url":"https://www.bbc.co.uk/news/world-middle-east-68945445"}],"text":"BBC May 2024 investigation: ex-intelligence officer Col Rabih Alenezi testified he was ordered April 2020 to evict al-Khuraybah and that order stated Huwaitat were 'many rebels' and 'whoever continues to resist [eviction] should be killed' — licensing lethal force; Abdul Rahim al-Huwaiti was shot dead 13 April 2020 after refusing land valuation and posting protest videos (state claimed he opened fire; UN/NGOs say killed for resisting)."},{"contradicted_by":[],"grade":"confirmed","id":"clm_4b0981323e","salience":"high","sources":[{"published_at":"2024-04-08","publisher":"RFI","title":"Staff at France's EDF question involvement in futuristic Saudi city","url":"https://www.rfi.fr/en/international/20240408-staff-at-france-s-edf-question-involvement-in-futuristic-saudi-city-neom-energy-electricity"}],"text":"EDF staff dissent: 73% of respondents in late-2022 FO union survey in hydro-engineering department opposed NEOM, saying it was contrary to EDF's ethical charter and net-zero 2050 commitment; staff argued Nestor pumped-hydro would be carbon-free but building NEOM would generate ~1.8 gigatonnes CO2 (4x UK annual emissions per UNSW estimate cited by Radio France); union sought right to withdraw for environmental/ethical reasons."},{"contradicted_by":[],"grade":"confirmed","id":"clm_191493d29e","salience":"high","sources":[{"published_at":"2025-06-25","publisher":"RFI","title":"Saudi Arabia drops France's EDF from desert megacity project","url":"https://www.rfi.fr/en/international/20250625-france-s-edf-exits-controversial-saudi-arabian-desert-megacity-project-neom"}],"text":"EDF contract terminated: Saudi authorities informed EDF March 2025 they no longer required Nestor hydro plant, opting for PV/wind/batteries for scaled-down NEOM; RFI notes The Line reduced to 2.4km as cost exploded from $500bn to $8.8tn estimate (Bloomberg); staff at La Motte-Servolex (30-40 employees, 3-4 years work) described abrupt stop as 'violent and depressing' while others called abandonment 'good news.'"},{"contradicted_by":[],"grade":"confirmed","id":"clm_438ee6818b","salience":"medium","sources":[{"published_at":"2025-06-25","publisher":"RFI","title":"Saudi Arabia drops France's EDF from desert megacity project","url":"https://www.rfi.fr/en/international/20250625-france-s-edf-exits-controversial-saudi-arabian-desert-megacity-project-neom"}],"text":"NEOM safety/engineering critique beyond wind/seismic: RFI citing WSJ/FT reports 100,000+ workers in area size of Belgium, overcrowded camps, inadequate infrastructure, absence of comprehensive emergency plan (2022 independent reports), and five fatal accidents in Nov 2024 at work sites/roads; new acting CEO Aiman al-Mudaifer launched comprehensive review in 'environment of limited resources' amid falling oil prices."},{"contradicted_by":[],"grade":"confirmed","id":"clm_702e78410e","salience":"high","sources":[{"published_at":"2022-01-19","publisher":"Greenpeace","title":"Perseverance brought 3 Greenpeace projects to fruition – A look back at 2021","url":"https://www.greenpeace.org/eastasia/blog/7237/perseverance-brought-3-greenpeace-projects-to-fruition-a-look-back-at-2021"},{"published_at":"2023-06-29","publisher":"GlobalVoices","title":"Can Hong Kong afford its planned artificial island construction project?","url":"https://globalvoices.org/2023/06/29/can-hong-kong-afford-its-planned-artificial-island-construction-project"},{"published_at":"2025-11-16","publisher":"ArcGIS","title":"Hong Kong: Built on Borrowed Sea","url":"https://storymaps.arcgis.com/stories/21fec0579dc14460961189214845a1ff"},{"published_at":"2017-04-17","publisher":"SCMP","title":"Green group calls on Hong Kong government to cut back on Lantau reclamation project","url":"https://www.scmp.com/news/hong-kong/health-environment/article/2088244/green-group-calls-hong-kong-government-consider"}],"text":"Lantau/Kau Yi Chau environmental coalition opposition: 15 green groups released joint statement Nov 2021 urging Environmental Protection Department to reject rushed Lantau EIA (only two working days before press conference); Green Earth submission to LegCo warned reclamation would destroy Chinese white dolphin habitat (Grade 1 national protected animal) and require massive marine sand mining destroying river/sea beds; StoryMaps documents Lantau waters dolphin collapse from 188 in 2003 to 3-4 after airport reclamation, with 25% of Hong Kong coastline already reclaimed."},{"contradicted_by":[],"grade":"confirmed","id":"clm_a0aa267e5e","salience":"high","sources":[{"published_at":"2023-06-29","publisher":"GlobalVoices","title":"Can Hong Kong afford its planned artificial island construction project?","url":"https://globalvoices.org/2023/06/29/can-hong-kong-afford-its-planned-artificial-island-construction-project"},{"published_at":"2025-01-06","publisher":"SCMP","title":"Slow down on Hong Kong's less-urgent public projects to save money: lawmakers","url":"https://www.scmp.com/news/hong-kong/society/article/3293646/slow-down-hong-kongs-less-urgent-public-projects-save-money-lawmakers"},{"published_at":"2025-06-17","publisher":"SCMP","title":"Halt Lantau reclamation plan or risk Northern Metropolis bids: Hong Kong developers","url":"https://www.scmp.com/news/hong-kong/society/article/3314820/halt-lantau-reclamation-or-risk-northern-metropolis-bids-hong-kong-developers"}],"text":"Lantau fiscal deficit critique: reclamation alone HK$580bn ($74bn) per government, veteran engineer Jason Poon estimates HK$900bn ($115bn) with infrastructure vs HK$400bn ($51bn) land-sale revenue = HK$500bn deficit; economist Andy Kwan warns fiscal reserves could be drained in a decade; Legislative Council lawmakers Jan 2025 urged delaying less-urgent projects to tackle ~HK$100bn deficit (double budget projection, similar to HK$101.6bn 2023-24); Real Estate Developers Association (Louis Loong) said government cannot support Lantau and Northern Metropolis concurrently and should permanently halt Lantau to avoid depressing Northern Metropolis land bids."},{"contradicted_by":[],"grade":"likely","id":"clm_b090ae5b65","salience":"medium","sources":[{"published_at":"2023-06-29","publisher":"GlobalVoices","title":"Can Hong Kong afford its planned artificial island construction project?","url":"https://globalvoices.org/2023/06/29/can-hong-kong-afford-its-planned-artificial-island-construction-project"}],"text":"Lantau reclamation failure-risk base rate: Libre-research/Greenpeace Feb 2023 review of 52 artificial island projects worldwide found 46% incomplete/delayed/abandoned/vacant, rising to 77% for 13 mega-reclamations >1,000 ha (only one fully completed); former Hong Kong Observatory director Lam Chiu-ying argued project violates Xi Jinping's 'ecological civilization' principle and raises sea-level/flooding risks amid climate crisis."},{"contradicted_by":[],"grade":"confirmed","id":"clm_47e3c60e74","salience":"high","sources":[{"published_at":"2018-08-19","publisher":"Interesting Engineering","title":"Atlantropa: Herman Sörgel's Vision of a New Continent","url":"https://interestingengineering.com/innovation/atlantropa-herman-sorgels-vision-of-a-new-continent"}],"text":"Atlantropa ecological/colonial critique: plan to lower Mediterranean 100m (west) to 200m (east) and expose 576,000 km2 would strand Venice/Genoa inland, increase Levant landmass 50%, disrupt salinity and climate (evaporative basin cut off from Atlantic), and was rejected as Eurocentric expansionism; Italians never supported it due to coastline dependence, Nazis ridiculed it as anti-Eurasian, and post-war nuclear power/decolonization rendered it technologically unnecessary and politically unfeasible."},{"contradicted_by":[],"grade":"confirmed","id":"clm_5bc69d26ad","salience":"high","sources":[{"published_at":"2026-07-02","publisher":"Nature Communications","title":"Improvement of the tensile strength of carbon nanotube fibers to 12.5 GPa by fluidics-induced alignment and densification","url":"https://www.nature.com/articles/s41467-026-75150-1"}],"text":"Carbon-nanotube scalability skepticism quantified: best 2026 fluidics-aligned fiber achieves 12.5 GPa tensile strength (7.5 N/tex, 370 GPa modulus) approaching lower limit of individual CNTs (13-80 GPa), but still ~12x below Obayashi's required 150 GPa for 96,000km ribbon; paper notes macroscopic fibers to date exhibit only fraction of individual CNT properties due to alignment/packing defects, and only 15% strain stretching is possible without deterioration — supporting 'material does not exist at scale' is order-of-magnitude barrier."},{"contradicted_by":[],"grade":"confirmed","id":"clm_1a0a82dabe","salience":"high","sources":[{"published_at":"2026-02-22","publisher":"Vision2030.ai","title":"Saudi Fiscal Breakeven Oil Price 2026: $80-85 Estimate","url":"https://vision2030.ai/encyclopedia/oil-price-impact-saudi-economy"}],"text":"Saudi fiscal oil-price sensitivity as structural blocker for NEOM: IMF/Oxford Economics breakeven $80-85/bbl vs Bloomberg $96 and all-in (incl. PIF domestic spending) >$110; Brent fell to $61-66 late 2025 (IMF baseline $66.94 for 2025, $62.38 for 2026) driving 2025 deficit ~SAR245bn (5.3% GDP) and Q1 2026 deficit SAR125.7bn ($33.5bn, largest since 2020) despite non-oil revenue SAR116.3bn; 2026 budget assumes deficit SAR165bn (3.3% GDP) at high-$60s/low-$70s oil, with public debt SAR1,457bn (31.7% GDP) end-2025 rising to SAR1,622bn (32.7%) end-2026."},{"contradicted_by":[],"grade":"contested","id":"clm_1d9fb499c8","salience":"medium","sources":[{"published_at":"2023-06-29","publisher":"GlobalVoices","title":"Can Hong Kong afford its planned artificial island construction project?","url":"https://globalvoices.org/2023/06/29/can-hong-kong-afford-its-planned-artificial-island-construction-project"}],"text":"Oceanix regulatory/insurance vacuum and cost critique: no evidence of operational habitation beyond prototype design (6.3ha/12,000 residents) despite UN-Habitat May 2024 'being implemented' claim; profile's own gap notes no independent peer review of 3-4km spiral tube pressure design and no Korean legal framework for floating habitation/insurance; GlobalVoices base rate (46% incomplete, 77% for >1,000ha) implies floating-city scaling faces same fiscal/regulatory fat-tail as Lantau."}],"sources":["https://m.economictimes.com/news/international/us/in-2004-japanese-engineers-proposed-a-mile-high-pyramid-over-tokyo-bay-14-times-taller-than-the-great-pyramid-meant-to-house-a-million-people-a-mega-city-we-still-cannot-build/articleshow/132511163.cms","https://soranews24.com/2014/11/21/a-vision-of-the-future-we-cant-take-our-eyes-off-shimizu-corporations-ocean-spiral-design","https://www.obayashi.co.jp/en/thinking/detail/space_elevator.html","https://phys.org/news/2018-09-japanese-company-tiny-space-elevator.html","https://www.rfi.fr/en/international/20240408-staff-at-france-s-edf-question-involvement-in-futuristic-saudi-city-neom-energy-electricity","https://www.theguardian.com/world/2024/apr/10/the-line-saudi-arabia-scaling-back-plans-105-mile-long-desert-megacity-crown-prince","https://www.newsweek.com/how-saudi-arabias-futuristic-megacity-will-progress-in-2026-11244377","https://www.preventionweb.net/news/un-habitat-and-partners-unveil-oceanix-busan-worlds-first-prototype-floating-city","https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3325023/hong-kong-government-lacks-necessary-conditions-lantau-reclamation-project","https://www.scmp.com/news/hong-kong/hong-kong-economy/article/3204037/authorities-raise-price-tag-artificial-islands-hong-kongs-lantau-hk580-billion","https://hongkongfp.com/2025/09/11/hong-kong-lacks-necessary-conditions-to-start-controversial-lantau-reclamation-project-minister-says","https://www.newsweek.com/jeddah-tower-worlds-tallest-skyscraper-construction-milestone-12401838","https://interestingengineering.com/innovation/atlantropa-herman-sorgels-vision-of-a-new-continent","https://www.strategy-business.com/article/Why-do-large-projects-go-over-budget","https://www.bbc.co.uk/news/world-middle-east-68945445","https://www.middleeasteye.net/news/saudi-arabia-neom-tribespeople-jailed-resisting-displacement","https://news.un.org/en/story/2023/05/1136322","https://www.rfi.fr/en/international/20250625-france-s-edf-exits-controversial-saudi-arabian-desert-megacity-project-neom","https://www.greenpeace.org/eastasia/blog/7237/perseverance-brought-3-greenpeace-projects-to-fruition-a-look-back-at-2021","https://globalvoices.org/2023/06/29/can-hong-kong-afford-its-planned-artificial-island-construction-project","https://storymaps.arcgis.com/stories/21fec0579dc14460961189214845a1ff","https://www.scmp.com/news/hong-kong/health-environment/article/2088244/green-group-calls-hong-kong-government-consider","https://www.scmp.com/news/hong-kong/society/article/3293646/slow-down-hong-kongs-less-urgent-public-projects-save-money-lawmakers","https://www.scmp.com/news/hong-kong/society/article/3314820/halt-lantau-reclamation-or-risk-northern-metropolis-bids-hong-kong-developers","https://www.nature.com/articles/s41467-026-75150-1","https://vision2030.ai/encyclopedia/oil-price-impact-saudi-economy"],"corrections":[],"how_to_cite":"Cite the article URL and the claim id. Grades are Ohmega's assessment of each claim as of the date shown, not a guarantee. Source texts belong to their publishers.","cite_as":"https://ohmega.monster/articles/nine-giant-building-projects-that-were-seriously-backed-and-49af97","api_url":"https://ohmega.monster/api/v1/articles/nine-giant-building-projects-that-were-seriously-backed-and-49af97","data_url":"https://ohmega.monster/data/articles/nine-giant-building-projects-that-were-seriously-backed-and-49af97.json"},"meta":{"as_of":"2026-09-23","source":"ohmega.article/1","version":"v1","cite_as":"https://ohmega.monster/articles/nine-giant-building-projects-that-were-seriously-backed-and-49af97","license":"Ohmega claims, summaries, grades, Pulses and forecasts may be quoted with a link to cite_as. Source texts belong to their publishers; follow the source URLs. No warranty: readings are our assessment as of as_of, not guarantees.","verification":"publishable","note":"claims[] (when present) carry grade: confirmed, likely, contested, unconfirmed/speculative (a lead, not established), opinion (attributed). Grades are our assessment as of as_of."}}