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During the final stages of the war, the Tunny network became increasingly disorganised.

One carried the radio equipment, which had to be kept well away from teleprinters for fear of interference.

International teleprinter code assigns a pattern of five pulses and pauses to each character.

Using the Bletchley convention of representing a pulse by a cross and no pulse by a dot, the letter C, for example, is •••. gave each link a piscine name: Berlin-Paris was Jellyfish, Berlin-Rome was Bream, Berlin-Copenhagen Turbot (see right-hand column).

After a year-long struggle with the new cipher, Bletchley Park first read current Tunny traffic in July 1942.

Tunny decrypts contained intelligence that changed the course of the war in Europe, saving an incalculable number of lives.

As in the case of Enigma, the rim of each wheel was marked with numbers, visible to the operator through a window, and somewhat like the numbers on the rotating parts of a combination lock.

Tunny messages sent by radio were first intercepted by the British in June 1941.

A radio operator then transmitted the ciphertext in the form of Morse code.

Morse code was not used with Tunny: the output of the Tunny machine, encrypted teleprinter code, went directly to air.

A later version, the SZ42A, was introduced in February 1943, followed by the SZ42B in June 1944.

‘40’ and ‘42’ appear to refer to years, as in ‘Windows 97’.

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