A documented inventory of confirmed and corroborated underground military, government, and strategic facilities worldwide โ sourced exclusively from public records, declassified documents, and credible reporting.
Select a country to explore documented underground facilities. All entries are sourced from public records and graded by evidence confidence level.
Cheyenne Mountain, Raven Rock, Mount Weather and extensive missile silo network.
Soviet-era and US military underground infrastructure documented in public conflict records.
Pine Gap Joint Defence Facility and documented military underground infrastructure.
Cold War Alpine tunnel networks and documented NATO infrastructure.
NATO headquarters underground infrastructure and Cold War continuity facilities.
ลฝeljava Air Base โ massive Yugoslav-era underground military airfield carved into Mount Pljeลกevica.
Strategic military installations and documented subterranean infrastructure.
Diefenbunker Cold War Central Emergency Government Headquarters, Carp, Ontario.
Yulin Naval Base submarine tunnels, Hainan Island and strategic command facilities.
Soviet-era Warsaw Pact underground command facilities.
Cold War NATO bunker network and Thule Air Base infrastructure.
Zawyet El Aryan restricted military zone โ subterranean complex reported in archaeological and military records.
Burlington (Site 3) Cold War government bunker, Corsham, Wiltshire.
Helsinki Civil and Military underground shelter network documented by Finnish Ministry of Interior.
BA 921 Taverny strategic Air Force command center beneath a gypsum quarry, now decommissioned.
Soviet-era military underground installations in the Caucasus region.
Marienthal Nuclear Bunker Cold War government continuity facility, now a public museum.
Cold War NATO underground command bunkers partially documented in declassified NATO records.
Cold War era tunnel networks and documented military infrastructure.
Soviet-era Warsaw Pact underground command and continuity facilities.
Strategic tunnel complexes in the Himalayas documented in Indian parliamentary defence records.
Strategic military installations and documented underground infrastructure.
Fordow nuclear enrichment facility half a mile underground, IAEA documented.
Saddam-era underground bunker network documented in declassified coalition records.
Negev Nuclear Research Center underground facilities documented by Federation of American Scientists.
West Star (Affi) Cold War NATO underground command bunker, decommissioned 2007.
Matsushiro Imperial HQ 6km tunnel network under Mt. Zo, built for WWII government relocation.
Documented underground military infrastructure from declassified Western intelligence.
Strategic tunnel infrastructure and documented military installations.
Documented underground infrastructure including military installations and tunnel networks.
Cold War NATO underground command facilities and documented continuity infrastructure.
Cold War era military installations and documented underground infrastructure.
Extensive underground missile and nuclear facilities documented by UN and IAEA satellite imagery.
Olavsvern Naval Base Cold War submarine facility carved into Arctic rock.
Nuclear storage and strategic military underground facilities documented in public defence records.
US military era underground installations and documented tunnel networks.
Project Riese Nazi-era tunnel complex in the Owl Mountains, Walimskie Drifts publicly accessible.
Ceausescu-era underground bunker network documented in post-communist public records.
Yamantau Mountain complex and Metro-2 alleged government subway system.
Strategic military underground infrastructure documented in public defence records.
Yugoslav-era underground military infrastructure including documented command facilities.
Apartheid-era nuclear and military underground facilities documented in post-apartheid records.
Command Post Tango joint US-ROK nuclear-hardened command bunker, Korean Peninsula defense operations.
Cold War NATO bunkers and documented military underground infrastructure.
Muskรถ Naval Base Cold War submarine facility tunnelled into granite island, Stockholm archipelago.
National Redoubt network of 370,000 military and civilian shelters built into the Alps.
Chiashan Air Force Base hardened underground aircraft hangars, eastern Taiwan.
Strategic military installations and documented underground infrastructure.
Incirlik Air Base NATO nuclear storage infrastructure documented in public DoD and NATO records.
Soviet-era underground command and military facilities, multiple documented locations.
Cu Chi and Vinh Moc tunnel systems documented public museums, Vietnamese Ministry of Culture.
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