Underground hangar

Countries that have used underground hangars include Albania, China, Italy, North Korea, Norway, Sweden, Switzerland, Taiwan, Yugoslavia, Iran, Vietnam, South Africa and Pakistan.

[4] The Washington Post reported in 2012 based on the results FOIA requests to the US government that the US Army Corps of Engineers brought in US construction contractors to build installations in the south of Israel including underground hangars for fighter-bombers as a part of US military aid to Israel.

[9] In 1941 the Swedish Air Force began building its first underground hangar at Göta Wing (F 9), located near Gothenburg in south-west Sweden, it was commissioned in 1944.

[10] After World War II plans were made up for building underground hangars at every air force base that had suitable rock conditions.

[10] After that plans were finalized for building underground hangars capable of surviving close hits by tactical nuclear weapons.

Aeroseum, an aircraft museum open to the public in Gothenborg, is housed in the larger cold war era Underground Hangar at Säve.

[16][17] Chiashan Air Force Base, located in Hualien, has an extensive underground hangar system which can accommodate two hundred aircraft.

During the Yugoslav Wars, most of these bases were used by the Serbs in certain operations, but due to circumstances imposed by the Croat forces, they were destroyed and later rendered useless for military use.

Nowadays, they are popular for urban exploration, however it is risky due to the chances of anti-personnel landmines being located in unexplored areas.

A Mirage III RS in front of an aircraft cavern in Buochs Airport , Switzerland
Underground hangar portal at Bodø.
Sweden
A Mirage III RS being towed out of a cavern on Buochs Airport , Switzerland (1999)
Underground hangar portal at Željava.