Coordinates: 33°55′03″S 151°00′54″E / 33.917610°S 151.014900°E The Bankstown Bunker (Air Defence Headquarters Sydney) is a defunct Royal Australian Air Force (RAAF) operations facility, located on the corner of Marion and Edgar Street, Bankstown, New South Wales. After the arrival of General Douglas MacArthur in Australia during the Second World War, Bankstown Airport was established as a key strategic air force base to support the war effort. During this period the specially constructed bunker became an important RAAF headquarters from 1945 until its closure in 1947. The Bankstown bunker is currently buried under a public park which lies at the end of Taylor Street.
From 1945 to 1947 the Bankstown bunker was used as a covert Royal Australian Air Force (RAAF) base. Construction of the facility commenced in late 1942 at a cost of £30,579 with its official commissioning in January 1945 as the headquarters for No. 1 Fighter Sector RAAF. This unit had previously operated from the Capital Hall picture theatre in Bankstown and a tunnel under the St. James Railway station.
The bunker was manned at all times in shifts that the Air Force called "Flights". Most of the personnel that worked in the bunker were local. Even so, the Air Force provided accommodation for them in Chapel Road, Bankstown whilst buses with blacked out windows transported military personnel to the bunker. All staff for the bunker had to undergo special training, including 'plane identification' training that also took place at Chapel Road.