Aircraft cavern, a calque of the German word Flugzeugkaverne, is an underground hangar amongst others used by the Swiss Air Force. == Historical == During World War II, the neutral Swiss military airfields were equipped with simple arched concrete U-43 type shelters to protect the aircraft parked underneath.
Aircraft cavern, a calque of the German word Flugzeugkaverne, is an underground hangar amongst others used by the Swiss Air Force. == Historical == During World War II, the neutral Swiss military airfields were equipped with simple arched concrete U-43 type shelters to protect the aircraft parked underneath.
Source: Wikipedia "Aircraft cavern" · CC BY-SA 4.0
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