The German Enigma machine was meant to be unbreakable, but a team of brilliant minds at Bletchley Park - led by figures like Alan Turing - deciphered its secrets. Their intelligence, codenamed Ultra, provided the Allies with a constant, critical advantage. This WW2 documentary reveals the full, thrilling history of the Enigma code break, the development of the revolutionary Colossus computer, and how the Ultra secret saved thousands of lives and shortened WW2 by years.
