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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.
"These two huts have a limited lifespan — a few years at most," said Greenish. "To lose Huts 3 and 6 would be something we should definitely not allow to happen."
Hut 3 housed the analysts who interpreted the material deciphered by those working in Hut 6. The huts are listed buildings and, to be renovated, they need to be taken apart and have new timbers spliced in.
Historians have speculated that, without the efforts of the codebreakers of Bletchley Park, the Allies may not have won WWII. Greenish said he believes Bletchley Park to be "one of the most important sites of the 20th century".