Underground hangar
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 M113 in Cavern Turtmann
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F-5E in Cavern
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Hawker Hunter in Cavern
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Patrouille Suisse F-5E in Cavern
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F/A-18 and F-5 Cavern Meiringen
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An underground hangar is a type of hangar for military aircraft, usually dug into the side of a mountain for protection. It is bigger and more protected than a hardened aircraft shelter (HAS).
An underground hangar complex may include tunnels containing the normal elements of a military airbase - fuel storage, weapon storage, rooms for maintaining the aircraft systems, a communications centre, briefing rooms, kitchen, dining rooms, sleeping areas and generators for electrical power.
Countries that have used underground hangars include Albania, China, India, Pakistan, Italy, North Korea, Norway, South Africa, Sweden, Switzerland, Taiwan, Vietnam and Yugoslavia.
The Indian Air Force operates underground hangars. Sukhoi Su-30 MKI have been stationed at Trishul Air-base situated in Bareilly, Uttar Pradesh, India. It houses one of the largest underground hangars in Asia.
Hindon, situated in Uttar Pradesh, a 5 minutes flight from Delhi is the 8th largest in the world, with one of the most complex and massive underground hangars and facilities. It is the home base for C-130J, C-17 Globemaster and Mi-17.
Adampur, situated in Punjab, houses an air-base with underground hangars. It is the home base for MiG-29s.
Pakistan has an underground hangar facility for the Pakistan Air Force at PAF Base Mushaf, Sargodha, Punjab.
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Wikipedia