Underground Facilities
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.
Browse by Country
Select a country to explore documented underground facilities. All entries are sourced from public records and graded by evidence confidence level.
USA
Cheyenne Mountain, Raven Rock, Mount Weather and extensive missile silo network.
Afghanistan
Soviet-era and US military underground infrastructure documented in public conflict records.
Australia
Pine Gap Joint Defence Facility and documented military underground infrastructure.
Austria
Cold War Alpine tunnel networks and documented NATO infrastructure.
Belgium
NATO headquarters underground infrastructure and Cold War continuity facilities.
Bosnia
ลฝeljava Air Base โ massive Yugoslav-era underground military airfield carved into Mount Pljeลกevica.
Brazil
Strategic military installations and documented subterranean infrastructure.
Canada
Diefenbunker Cold War Central Emergency Government Headquarters, Carp, Ontario.
China
Yulin Naval Base submarine tunnels, Hainan Island and strategic command facilities.
Czech Republic
Soviet-era Warsaw Pact underground command facilities.
Denmark
Cold War NATO bunker network and Thule Air Base infrastructure.
Egypt
Zawyet El Aryan restricted military zone โ subterranean complex reported in archaeological and military records.
England
Burlington (Site 3) Cold War government bunker, Corsham, Wiltshire.
Finland
Helsinki Civil and Military underground shelter network documented by Finnish Ministry of Interior.
France
BA 921 Taverny strategic Air Force command center beneath a gypsum quarry, now decommissioned.
Georgia
Soviet-era military underground installations in the Caucasus region.
Germany
Marienthal Nuclear Bunker Cold War government continuity facility, now a public museum.
Greece
Cold War NATO underground command bunkers partially documented in declassified NATO records.
Hong Kong
Cold War era tunnel networks and documented military infrastructure.
Hungary
Soviet-era Warsaw Pact underground command and continuity facilities.
India
Strategic tunnel complexes in the Himalayas documented in Indian parliamentary defence records.
Indonesia
Strategic military installations and documented underground infrastructure.
Iran
Fordow nuclear enrichment facility half a mile underground, IAEA documented.
Iraq
Saddam-era underground bunker network documented in declassified coalition records.
Israel
Negev Nuclear Research Center underground facilities documented by Federation of American Scientists.
Italy
West Star (Affi) Cold War NATO underground command bunker, decommissioned 2007.
Japan
Matsushiro Imperial HQ 6km tunnel network under Mt. Zo, built for WWII government relocation.
Libya
Documented underground military infrastructure from declassified Western intelligence.
Malaysia
Strategic tunnel infrastructure and documented military installations.
Mexico
Documented underground infrastructure including military installations and tunnel networks.
Netherlands
Cold War NATO underground command facilities and documented continuity infrastructure.
New Zealand
Cold War era military installations and documented underground infrastructure.
North Korea
Extensive underground missile and nuclear facilities documented by UN and IAEA satellite imagery.
Norway
Olavsvern Naval Base Cold War submarine facility carved into Arctic rock.
Pakistan
Nuclear storage and strategic military underground facilities documented in public defence records.
Philippines
US military era underground installations and documented tunnel networks.
Poland
Project Riese Nazi-era tunnel complex in the Owl Mountains, Walimskie Drifts publicly accessible.
Romania
Ceausescu-era underground bunker network documented in post-communist public records.
Russia
Yamantau Mountain complex and Metro-2 alleged government subway system.
Saudi Arabia
Strategic military underground infrastructure documented in public defence records.
Serbia
Yugoslav-era underground military infrastructure including documented command facilities.
South Africa
Apartheid-era nuclear and military underground facilities documented in post-apartheid records.
South Korea
Command Post Tango joint US-ROK nuclear-hardened command bunker, Korean Peninsula defense operations.
Spain
Cold War NATO bunkers and documented military underground infrastructure.
Sweden
Muskรถ Naval Base Cold War submarine facility tunnelled into granite island, Stockholm archipelago.
Switzerland
National Redoubt network of 370,000 military and civilian shelters built into the Alps.
Taiwan
Chiashan Air Force Base hardened underground aircraft hangars, eastern Taiwan.
Thailand
Strategic military installations and documented underground infrastructure.
Turkey
Incirlik Air Base NATO nuclear storage infrastructure documented in public DoD and NATO records.
Ukraine
Soviet-era underground command and military facilities, multiple documented locations.
Vietnam
Cu Chi and Vinh Moc tunnel systems documented public museums, Vietnamese Ministry of Culture.
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