Construction began in June 1938, under the premiership of Neville Chamberlain, and it became operational on August 27, 1939, a week before the outbreak of the Second World War. The facility was shut after V-J Day. It was opened as a museum in 1984 and is presently managed by the Imperial War Museum.

See also

• Civil defence centres in London
• Military citadels under London
• Subterranean London