the canteen. Fasson and Grazier did drown while attempting to retrieve electrical equipment from a U-boat U-559 (which Cave describes as its four-rotor enigma) on 30 October 1942, while Brown survived only to die in a house fire during shore-leave before the end of the war. Fasson and Grazier were awarded the George Cross posthumously and Brown was awarded the George Medal. Fictional character Cave states he was completing his last posting on a destroyer, in November '42, when the books were acquired. There are historical records of the break in the ability of the British to decode the Naval enigma from 10 to 19 March 1943 when the third edition of the weather short signal codebook was deployed. The Katyn massacre, revealed after the discovery of mass graves of 4,500 Polish officers as depicted in the film, is a historical atrocity committed by Stalinist Russia in 1940. There is no evidence that details of the mass graves were intercepted by British intelligence, although it is possible. The first announcement of the discovery was broadcast by Radio Berlin on 13 April 1943. See also The Imitation Game - A 2014 biopic of Alan Turing and his involvement in cracking the Enigma. U-571 - A 2000 war film involving the capture of an Enigma machine. Cryptanalysis of the Enigma Ultra German submarine U-505 - A captured submarine - now on display in Chicago - that yielded an Enigma machine. References External links Enigma at Rotten Tomatoes Enigma at Box Office Mojo Review by Andrew Hodges 2001 films 2000s spy thriller films 2000s war films British spy thriller films British war films War romance films World War II films based on actual events World War II spy films Films based on British novels Films based on thriller novels Enigma machine Films shot at Elstree Film Studios Films shot at Pinewood Studios Films directed by Michael Apted Bletchley Park Cryptography in fiction Films set in 1943 Films with screenplays by Tom Stoppard Films scored by John Barry (composer) Films set in Buckinghamshire Films produced by Mick Jagger Films produced by Lorne Michaels 2000s English-language films 2000s British films