... 7000 people were working at Bletchley Park. Secrecy was extremely important. If the Germans had realize that the British were breaking Enigma they would have made things much more complicated for the British so many things had to be done to keep this secrecy, contact between the huts was by way of tubes, through which messages were forced by compressed air. This meant that the different huts almost never came into direct contact with each other. This breaking up of Bletchley Park into self-contained sections was a deliberate policy so that any possible German spy would not know what was going on. Organization was vital to keep Bletchley Park going. Station X also known as Bletchley Park received messages from German operators that had been picked up by wireless stations scattered around Britain. Messages transmitted to and from U-boats were intercepted in Britain by Royal Air Force 'listening' stations, known as 'Y' ...

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