Movies have portrayed headcounters a huge underground cave with high power equipment. These buildings were used for intelligence purposes during the world war 2. This is a common setting for

as the headquarters of the UK Security Service (commonly known as MI5), along with being the London site of the Northern Ireland Office (NIO).

The SIS Building, also commonly known as the MI6 Building, is the
headquarters of the British Secret Intelligence Service (otherwise
known as "MI6").

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