Story of Enigma (2015)

Documentary telling the story of the seemingly unbreakable code encrypted by the Germans. First used in the 1920s to send messages relating to markets, Enigma became an invaluable tool to the Nazis as they exploited its indecipherability to transmit radio messages to the battlefield, keeping one step ahead of the Allies, until one day in 1941 when the team at Bletchley Park cracked the code.