The Y Service 1939-1945

Hut 1

Early 1939 - present

Various uses, including bombe testing, fire station, Transport Office, and first aid post.

Hut 2

Aug 1939 - 1946

On what is now the Mansion car-park. Various uses, including NAAFI Refreshment Hut (1939 - 1954), lending library (1939 – 1942), language evening classes and emergency casualty clearing station.

Hut 3

Summer1940 – present

Close to Hut 6 German Army and Air Force Enigma Reporting Section (Jul 1940 – Feb 1943) Renumbered Hut 23 in Feb 1943.

Hut 4

Aug 1939 - present

Alongside the South side of the Mansion Naval Section (Aug 1939 – Mid 1942) Elements of Military Section, including Japanese, from Aug 1942 WT Coordination /CTR (Cover Traffic Records): From Jan 1944

Hut 5

Oct 1939 - 1945

Close to Hut 4Elements of Military Section, including Japanese and Balkans (Oct 1939 – 1945) Elements of Naval Section to Aug 1942. Cypher Operators Training School to Jan 1943 Medical Centre (Jun 1943 – late 1945) Security of Allied Cyphers Section from Nov 1944

Hut 6

Jan 1940 - present

Close to Hut 1, 3 and 8
German Army and Air Force Enigma Processing and Decryption Section (Jan 1940 – Feb 1943). Renumbered Hut 16 in Feb 1943.

Hut 7

May 1940 – post war.

Close to the end of Block B, near Block C
Hollerith Punched-Card Machine Section (May 1940 – Nov 1942). Half of Hut 7 retained for Hollerith operators training school when most machinery moved to Block C. Naval Section, cryptography (Nov 1942 - Jul 1943) Naval Section, Japanese Cryptography (NS IJ – Hugh Foss) (Jul 1943 – 1945)

Hut 8

Early 1940 - present

Alongside Hut 1, close to Hut 6 and to West of Block A
German Naval Enigma Processing and Decryption Section (Feb 1940 – Feb 1943) Renumbered Hut 18 in Mar 1943

Hut 9

Oct 1940 – post war

On what is now the Mansion car-park close to the tennis-courts
Mainly Administration Section. Other users included Naval Section and ISOS (Oct 1941 – Feb 1942).

Hut 10

Spring 1940 – present

Just to the East of Hut 3, alongside Hut 11.
Air Section (Spring 1940 – Aug 1942)
SIS Codes Section (Aug 1942 – Mar 1945)
Japanese Forces Section (JAFO) ) (Mar - Aug 1945)

Hut 11

Late 1940 - present

Complex of huts, close to and East of Hut 6.
Bombe operations, including control centre, training centre and administration (late 1941 – 1945).
Also used for testing Heath Robinson and Colossus.

Hut 12

Aug 1941- present

To North of Hut 3 until Aug 1942, moved to near site entrance.
Intelligence Exchange (Sep 1941 – Aug 1942)
Education Hut (Apr 1943 – 1945). Classes, concerts, religious services, and finally for Army resettlement courses from mid 1945.

Hut 14

Late 1941 – post war

Probably east/north-east of Hut 8, close to Blocks A & E
Communications Section. Housed at various times teleprinters, the Traffic and Cypher Office, Central Signals Registry
and Cover Traffic and Records Section.

Hut 15

Early 1941 - present

Collection of 4 Huts. close to the North of Hut 3 and Hut 10
SIXTA

Hut 16

Mar 1943 –present.

Renumbered from Hut 6, now known by its original number.
ISK (Mar 1943 –Sep 1943) Naval Section overflow (Sep 1943 – 1945)

Hut 18

Mar 1943 – present.

Renumbered from Hut 8, now known by its original number. ISOS (Mar 1943- Oct 1943) Naval Section Japanese Training School (Nov 1943- 1945)

Hut 23

Feb. 1943 -present

Renumbered from Hut 3, now known by its original number.
Various uses, including Photographic Section, Engineering Department and bombe technical support staff.

Block A

Jul 1942 - present

North of the Lake, running into the East end of Block B
Naval Section (Aug 1942 - 1945)
Air Section upper floor only (Aug 1942 – Jun 1943). Naval Section occupied both floors from Jun 1943.

Block B

Aug 1942 - present

North-East of the Lake, running into Block A Naval Section (Sep 1942 – 1945)

Block C

Nov. 1942 -present

North-East of the lake, across road beyond Block B
Hollerith Punched-Card Machine Section (Nov. 1942 – 1945).

Block D

Feb. 1943 -present

North of Blocks A, B, and EGerman Navy, Army and Air Force Enigma Processing and Decryption Section (Huts 3,6 and 8)(Feb 1943 – 1945)

Block E

Mar 1943 -present

Immediately North of Block A The Communications Centre (Feb 1943 – 1945). Cypher Office, Central Signals, Registry, Auto Room, Teleprinter Room.

Block F

Jul 1943 - 1987

East of Blocks E, D and G. Air Section (Sep 1943 – 1945) Newmanry (Nov 1943 - 1945) Testery (Sep 1943 – 1945) Military Section (May 1944 - 1945)

Block G

Oct 1943 - present

North of Block D and connected to it in places
ISK and ISOS (Oct 1943 – 1945) SIXTA (Oct 1943 – 1945) Military Section, German Police and Military Section Secretariat. Japanese Forces Section (JAFO) (1945)

Block H

Jun 1944 - present

East of southern wings of Block F
Newmanry – Colossus and Robinson operations (Sep 1944 – 1945)