
Down Street station: Down Street opened as a London Tube station in 1907. It served the Piccadilly line until closing in 1932.

Station map: The disused station is in Mayfair, between today's Hyde Park Corner and Green Park stations.

Second life: "All of the things that made it not viable as a station made it absolutely perfect for secret bunkers during the Second World War," says London Transport Museum's Siddy Holloway.

New HQ: In 1939, the newly reformed Railway Executive Committee (REC) took over Down Street as their wartime headquarters.

Typing pool: This was the typing pool where eight secretaries would sit working at their typewriters. Plasterboard still clings to the tiles.

Lift shaft: The former lift shaft today provides ventilation to the Piccadilly line.

The descent: The platforms at Down Street are 73 feet below ground level, making them excellently positioned for a bomb-proof shelter.

Sheltering Churchill: British Prime Minister Winston Churchill took shelter here overnight at least five times in the winter of 1940.

Mind the gap: When Piccadilly trains race past during public tours, tour group members have to switch off all their lights so as not to blind the drivers.


