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I don't think any such specific information would be de-classified and even if someone knew, he won't be talking about it on the forums.
Having said that, I am sure they would have some sort of such facilities either underground or hardened facilities especially after what happened with Egypt, no serious airforce would let its plane in such a vulnerable position.
All are rumors. I heard that there are also underground/hidden hangers in Gujarat when I was little kid.
Trishul air-base (of Indian Airforce) is situated in Izzatnagar, Bareilly, Uttar Pradesh of India.
It has a squadron of State of the art fighters, the Sukhois and the heptor squadrons. The Trishul air-base in Bareilly had Foxbats capable of flying up to 80,000 feet. Presently, India has positioned its Sukhois only at Bareilly, Pune and Jodhpur. The underground hangar it possess is considered to be one of the largest in Asia.
Trishul Air-base - Wikipedia, the free encyclopedia
Sorry to say that I dont approve of many actions taken by tyrant Kim Jong Il and this idea (underground runway) is perhaps just another one. There are few aspects that need explanation before we even think of operating fighters from underground...
. What if a pilot has to go around or make a missed approach from finals due to any reason, what is he going to do? Slam into a hill??
. During takeoff or landing roll, what if there is an engine failure or a tyre burst and aircraft departs the runway...with no room to manoeuvre the aircraft on sides, what will be an outcome of such emergencies?
. A mentioned by SatishKumar, what about the vortices. Whenever an aircraft lands/takesoff, it generates huge vortices that generally dissipate in few minutes while blowing to the sides of open runways. But operating from a cave, where will they go? Many aircrafts have crashed while flying thru vortices and they pose a great danger to any aircraft type.
. What about the visual cues (horizon, attitude, runway references etc)? During a landing pilots uses a lots of visual cues and especially on short short finals, the landing a made while looking at the far end of runway. While landing in a cave @ 150 knots with no cues and also no place to go around, its going to be a big safety hazards.
. I am not sure that how much the aerodynamics or the lift generating capability of wing will suffer while operating from the cave? Also what will be the turbine engines response in such a case? What will be the thrust penalties?
. How much operational advantage will remain or how quickly it can be made re-operational if its breached by an attack?
Compare the cost of building such a huge undertaking vis a vis the operational benefits. Its not only 10,000feet long runway that one has to prepare but also huge logistical infrastructure to support the aircraft operations....We are talking of multi Billion $$$$ here....How many countries can afford that? Presently, there are how many operational underground airfields with that operate fast jets? I guess NONE.
IMO, if one is still too adamant to use an underground runway that shall perhaps be used for VTOL aircrafts, helicopters, UAVs , aircraft storage or may be aircraft shelters in which aircrafts can taxi in once they have landed on an open air runway etc ...
Uttarlai military airbase is situated in Barmer district, Uttarlai is India's first under ground airbase. India can counter any insurgency into India by Pakistan. The Battle of Longewala (December 4, 1971 - December 5, 1971) was one of the first major engagements in the Western Sector during the Indo-Pakistani War of 1971, fought between assaulting Pakistani forces and Indian defenders at the Indian border post of Longewala, in the Thar Desert of the Rajasthan state in India