This lecture gives a description of the Enigma machine and how it was used operationally by the Germans, followed by an explanation of the how the Enigma messages were broken with the Turing Bombe. Mr Frank Carter works for the Bletchley Park Trust and is an expert on the methods used to break the Enigma and similar codes. He is one of Bletchley Park's most experienced guides and regularly lectures on Colossus and Enigma. He recently gave a lecture on Polish code-breaking achievements to an audience, which included the Polish Ambassador.