October 2022 
In February 1942 the worst fears of the teams working on Enigma in Hut 8 and Naval Section were realised. The German navy introduced a new, more complex Enigma machine for use by its U-boats in the Atlantic. 
At a stroke, Bletchley Park was no longer able to read messages sent by the German submarines hunting the vital Atlantic convoys. 
By the end of the year, however, the new code had been broken, and BP was once again able to divine the secrets of the Atlantic U-boats. Just what was ‘SHARK’ and how was it broken by the team at BP?
Once again we are joined by Bletchley Park’s Research Historian Dr David Kenyon to find the answers.
Special thanks to Dr Ben Thomson for voicing our archival documents.
Featuring the following contributors from our Oral History Archive:
Arnold Hargreaves
Tommy Flowers
Image: ©Bletchley Park Trust 2022  
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