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One of the challenges now facing the Bletchley Park Trust is renovating the site's decrepit buildings, at an estimated cost of £5m. The Trust requires an additional £5m to develop the infrastructure and conferencing facilities.
Hut 6 (pictured) at Bletchley Park was built in 1940 to house the codebreakers working on deciphering the Enigma code, used to encrypt WWII German military communications.
Hastily erected during WWII, the buildings were only ever meant to be temporary.
"Huts 3 and 6 are not in very good order," said Simon Greenish, director of the Bletchley Park Trust. "We don't let people into Hut 6 [in general]."
Greenish allowed ZDNet.co.uk access to Hut 6 on condition that we were careful not to put our feet through the floor. Part of the corridor roof was missing.