War Rooms And NATO Tunnels is a complex of underground bunkers and tunnels built by the British from World War II. They were cut at a depth of over 40 m under the bastions of Saint James Cavalier and Saint John's Cavalier, Upper Barrakka Gardens and Saluting Battery. From 1943, they housed the headquarters of the Malta Defense Command, and in 1967-1977 the NATO base.
In total, nearly 1,000 people worked in the underground quarters, of which soldiers were the fourth part. There were mainly operating rooms, including the cipher room, the room for anti-aircraft operations and coastal defense, as well as the filter room, i.e. the place to which information gathered by radar stations located at various points of the Maltese Islands flowed.
The task of the special NATO unit operating here was to detect and monitor the activity of Soviet submarines in the Mediterranean. Currently, the underground complex is open to the public and serves as a museum.