Željava Air Base.

"Objekat 505"

Željava Air Base, situated on the border between Croatia and Bosnia and Herzegovina under Plješevica Mountain, near the town of Bihać in Bosnia and Herzegovina, was the largest underground airport and military airbase in the former Yugoslavia and one of the largest in Europe.The air base was used intensively during the Yugoslav Wars in early 1991. Construction of the "Objekat 505" (code name), better known as Željava or Bihać Air Base, began during 1957, and was completed in 1965. SFRJ in that time had spent around $6 Billion dollars constructing this object, which is 3 times the annual military budget of Serbia and Croatia put together today. It was one of the biggest and most expensive military constructions in Europe.
 In the course of its withdrawal, the Yugoslav Peoples Army (JNA) destroyed the airport by filling and igniting the explosive positions that were built-in during the construction phase of the base and as part of base design (see above). To prevent any possible future use of the complex and preclude any advantage to an opposing party the Military of Serbian Krajina finalized its demolition in 1992 by setting off an additional 56 tons of explosives. The ensuing explosion was so powerful that the nearby city of Bihać shook violently. Villagers say that there was smoke coming from inside of the tunnels even 6 months after the destruction.

Since Sep-2011