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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.