The first installation of the Air Force Depot, used to store fuel useful for warplanes and military vehicles, dates back to 1930. Stretching approximately 15 hectares, the Depot is surrounded by a high wall topped by barbed wire and guarded by numerous turrets in which, until its decommissioning in 2007, armed military personnel were spaced out. Highly impressive are the basements: long tunnels that lead into vast halls carved into the rock and lined with reinforced concrete. Inside these rooms, there are imposing iron cisterns, 50 meters long and 7 meters high, which stored fuels that were in turn pumped from the distant Su Siccu breakwater at the edge of the Port of Cagliari, in front of the hill of Bonaria. Through long pipes, in fact, the fuel, unloaded from large tankers, reached by a special pipeline the hill of Monte Urpinu and, from the basements of the 68th depot, the military airports of Elmas and Decimomannu. The dungeons accessible from the depot lead into large metal cisterns, The maze of underground tunnels extends for a total of about two kilometers of planimetric development, inspected for the first time after the passage of the property to the Regional State Property Office, and subsequently by the Sardinia Underground Association.
