War veterans Ruth Bourne, left, and Jean Valentine, who served in Women's Royal Navy Service during World War II, stand in front of the machine, that played a crucial part in cracking the Nazi, Enigma code,

Teams of highly skilled mathematicians, cryptologists, inventive thinkers and crossword enthusiasts would receive hundreds of Nazi codes and ‘guess’ the approximate real message or plain text.

This ‘crib’ would be given to the Wrens who would set it on the Bombe’s alphabet wheels.

By checking all the permutations, the crib would help locate the true message within the code.

"There were 210 such bookcase-like Bombes that gave Britain advance warning of Hitler’s plans and shortened the conflict by two years. "
This replica is called Phoenix.

This is such a good film -> "Enigma"

During the dark early days of World War II, the Nazis change the Enigma Code that commandeers their U-boat fleet -- and it's up to Tom Jericho (Dougray Scott), a brilliant code-breaker, to crack the new encryption. As if that weren't trouble enough, a German agent may have infiltrated the British code-breaking team. Kate Winslet co-stars, along with Saffron Burrows as Jericho's mysteriously missing fiancée.