Image for Beginner's Guide to Tunny.

Beginner's Guide to Tunny.

Duration: 01:34

This is part of the secret story behind one of the greatest intellectual feats of World War II, a feat that gave birth to the digital age. The super code that the British knew as Tunny was generated by a machine called the Lorenz (SZ40). Find out how the machine worked and why the Germans needed this code, which was tougher than the infamous Enigma.

Available since: Fri 21 Oct 2011


Keeley Hawes
Julian Carey
Julian Carey
Executive Producer
Tim Green

This clip is from

Timewatch Code-Breakers: Bletchley Park's Lost Heroes

Documentary revealing how two men hacked into Hitler's personal super-code machine.

First broadcast: 25 Oct 2011

Image for Code-Breakers: Bletchley Park's Lost Heroes Not currently available on BBC iPlayer

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