page_title: Bletchley Park
section_title: Huts
hierarchical_section_title: Bletchley Park / Additional buildings / Huts
context_page_description: Bletchley Park is an English country house and estate in Milton Keynes that became the principal centre of Allied code-breaking during the Second World War. The mansion was constructed during the years following 1883 for the financier and politician Sir Herbert Leon in the Victorian Gothic, Tudor, and Dutch Baroque styles, on the site of older buildings of the same name.
  During World War II, the estate housed the Government Code and Cypher School, which regularly penetrated the secret communications of the Axis Powers – most importantly the German Enigma and Lorenz ciphers; among its most notable early personnel the GC&CS team of codebreakers included Alan Turing, Gordon Welchman, Hugh Alexander and Stuart Milner-Barry. The nature of the work there was secret until many years after the war.
  According to the official historian of British Intelligence, the "Ultra" intelligence produced at Bletchley shortened the war by two to four years, and without it the outcome of the war would have been uncertain. The team at Bletchley Park devised automatic machinery to help with decryption, culminating in the development of Colossus, the world's first programmable digital electronic computer.
context_section_description: Often a hut's number became so strongly associated with the work performed inside that even when the work was moved to another building it was still referred to by the original "Hut" designation.
  Hut 1: The first hut, built in 1939 used to house the Wireless Station for a short time, later administrative functions such as transport, typing, and Bombe maintenance. The first Bombe, "Victory", was initially housed here.
  Hut 2: A recreational hut for "beer, tea, and relaxation".
  Hut 3: Intelligence: translation and analysis of Army and Air Force decrypts
  Hut 4: Naval intelligence: analysis of Naval Enigma and Hagelin decrypts
  Hut 5: Military intelligence including Italian, Spanish, and Portuguese ciphers and German police codes.
  Hut 6: Cryptanalysis of Army and Air Force Enigma
  Hut 7: Cryptanalysis of Japanese naval codes and intelligence.
  Hut 8: Cryptanalysis of Naval Enigma.
  Hut 9: ISOS (Intelligence Section Oliver Strachey).
  Hut 10: Secret Intelligence Service (SIS or MI6) codes, Air and Meteorological sections.
  Hut 11: Bombe building.
  Hut 14: Communications centre.
  Hut 15: SIXTA (Signals Intelligence and Traffic Analysis).
  Hut 16: ISK (Intelligence Service Knox) Abwehr ciphers.
  Hut 18: ISOS (Intelligence Section Oliver Strachey).
  Hut 23: Primarily used to house the engineering department. After February 1943, Hut 3 was renamed Hut 23.
caption: Hut 6 in 2004
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