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 air base - 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.[citation needed]

By country


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 Air Force Station, 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 Air Force Station, near Jalandhar, Punjab, has 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.[citation needed]



In 1941 the Swedish Air Force began building its first underground hangar at F 9 Säve, located near Gothenburg in south-west Sweden, it was commissioned in 1943. After World War II plans were made up for building underground hangars at every air force base that had suitable rock conditions. These ambitious building plans proved to be too expensive and were reduced to hangars at certain selected air bases. A second underground hangar was built in 1947 at F 18 Tullinge which began operating in 1950. After that plans were finalized for building underground hangars capable of surviving close hits by tactical nuclear weapons. This required that these new hangars be much deeper, with 25 to 30 meters of rock cover, and heavy-duty blast doors in concrete. The Saab 37 Viggen aircraft was designed with a folding tail fin to fit into low hangars. The Aeroseum an aircraft museum open to the public in Gothenburg is housed in the larger cold war era Underground Hangar at Säve.


Six Flugzeugkaverne (aircraft caverns), each with space for 30 or more aircraft, were constructed for the Swiss Air Force. One at Meiringen Air Base has been expanded to operate F/A-18 Hornet aircraft.[1] Originally, the plan for the aircraft cavern started its life as a design as a cavern-like aircraft hangar (German "Kavernenflugplatz") with the possibility launch combat aircraft from the mountain air base. High costs and technical difficulties prevented these from realisation[2][3] The idea of using roads as runways was later part of the design demands for the Swiss motorway network.[4][5]

Saudi Arabia

During the Gulf War, USAF and Saudi Air Force utilized underground hangars with good desert camouflage, and launched air raids against Saddam Hussein's air powers.[citation needed]

South Africa

South Africa has an underground hangar facility for the South African Air Force at Air Force Base Hoedspruit.[citation needed]


The only Taiwanese airbase with underground hangars is Jiashan Airbase, located in Hualien on the east coast of Taiwan, to guard against a massive missile strike launched from China. Underground hangars in Jiashan Airbase have deployed F-16 A/B and F-5 E-F squadrons.[citation needed]


The largest underground hangar complex in former Yugoslavia was at Željava Airport near Bihać, with enough space for 80 MiG-21s. Slatina Air Base, located at Pristina International Airport, contained the second largest.

North Korea

There are at least twenty major airfields with underground hangers in North Korea, including Onchon air base, Kang Da Ri Airport and Sunchon Airport.[6]

See also


  1. ^ F/A-18 inside cavern Meiringen AFB
  2. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2012-07-22. Retrieved 2012-07-22.  Historic Buildings of the Swiss Air Force (German)
  3. ^ Reduit und Schweizer Bunkerprojekte 1995
  4. ^ (in German) Flugplätze stehen unter Schutz bernerzeitung.ch
  6. ^ https://www.wired.com/2010/07/online-spies-spot-north-koreas-underground-airfields/

External links

External images
Aircraft cavern
M113 in Cavern Turtmann
F-5E in Cavern
Hawker Hunter in Cavern
Patrouille Suisse F-5E in Cavern
F/A-18 and F-5 Cavern Meiringen