On this episode of History Undone, Fergus Macphee is joined by Rear Admiral Dr Chris Parry and Nigel Jones to discuss one the allies' biggest breakthroughs in the Second World War: cracking the Enigma code. Despite being deemed 'unbreakable', Polish mathematicians had actually solved a version in 1932 and passed this work on to the British. The work of a group based in Bletchley Park, containing one Alan Turing helped the allies read more and more decrypted messages by 1941, but just how decisive was it and what if it had never happened? This is History Undone.
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