secure communications facility, the airbase contained tunnels housing two full fighter squadrons, one reconnaissance squadron, and associated maintenance facilities. The units based there were the 124.LAE (Fighter Aviation Squadron) and 125.LAE, both equipped with MiG-21bis fighter aircraft, and the 352.IAE (Reconnaissance Aviation Squadron), equipped with MiG-21R reconnaissance-fighter aircraft. The tunnels had a total length of , and the bunker had four entrances protected by 100-ton pressurized doors, three of which were customized for use by fixed-wing aircraft. Eventually, it was hoped that the base would be re-equipped with the indigenously developed Yu Supersonik aircraft. Underground "KLEK" complex The underground facility was lined with semicircular concrete shields, arranged every , to cushion the impact of incoming munitions. The complex included an underground water source, power generators, crew quarters, and other strategic military facilities. It also housed a mess hall that could feed 1,000 people simultaneously, along with stores of food, fuel and arms sufficient to last 30 days. Fuel was supplied by a underground pipe network connected to a military warehouse on Pokoj Hill near Bihać. Surface Above ground, the facility had five runways and within the immediate vicinity of the base, there were numerous short-range mobile tracking and targeting radars; surface-to-air missile sites equipped with; 2K12 "Kub" (NATO: SA-6) mobile surface-to-air missile interceptor systems, motorized infantry bases, two Quick Reaction Alert aircraft ready for take off at any moment, military police stations, and a hunting lodge used by civilian and military leaders on occasional leisure trips. Access points were heavily monitored and guards were authorized to fire upon anyone attempting to enter without authorization. However, in practice only special permits were required and unauthorized visitors usually turned away. Destruction The airbase was used intensively in 1991, during the Yugoslav Wars. During its withdrawal, the Yugoslav People's Army destroyed the runway by filling pre-built spaces (designed for the purpose) with explosives and detonating them. To prevent any possible further use of the complex by Croatian and Bosnia-Herzegovinan forces, the Military of Serbian Krajina completed the destruction in 1992 by setting off an additional 56 tonnes of explosives. The ensuing explosion was so powerful that it shook the nearby city of Bihać. Residents of nearby villages claimed that smoke continued to rise from the tunnels for six months after the explosion. Current status Local police forces and the CPA currently use the area to train canines with actual land mines, given the