The rows of silver dials and tangle of scarlet wires look more like a telephone exchange.
But this is the inside of the Turing Bombe, the part-electronic, part-mechanical code-breaking machine and forerunner of the modern computer, which cracked 3,000 messages a day sent on Nazi Enigma machines during the Second World War.
There were 210 such bookcase-like Bombes that gave Britain advance warning of Hitler’s plans and shortened the conflict by two years.
All were destroyed for security reasons on Churchill’s orders after the war. This is a replica, built by 60 volunteers, which was fired up last Tuesday.
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