Duration: 1 hour
Documentary that reveals the secret story behind one of the greatest intellectual feats of World War II, a feat that gave birth to the digital age. In 1943, a 24-year-old maths student and a GPO engineer combined to hack into Hitler's personal super-code machine - not Enigma but an even tougher system, which he called his 'secrets writer'. Their break turned the Battle of Kursk, powered the D-day landings and orchestrated the end of the conflict in Europe. But it was also to be used during the Cold War - which meant both men's achievements were hushed up and never officially recognised.
Martin Davidson reveals the secret lives and untold stories of WWII explored in a series of Timewatch specials, starting with Codebreakers: Bletchley Park's Lost Heroes.
Read Martin Davidson's full post on the BBC TV blog
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