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Željava Air Base is an underground military aviation complex built by the former Socialist Federal Republic of Yugoslavia. It is the largest in the Balkans and one of the most extensive underground air bases in Europe. Known by the code name "Objekt 505," the base was constructed inside the Plješevica Mountain near the town of Bihać, on the border between Bosnia and Herzegovina and Croatia. Thanks to its structure protected against nuclear attacks and its strategic location, the base was built a