Operation Ruthless, a plan aimed at obtaining details of the Enigma codes used by the German Navy, was instigated by a memo written by Fleming to Godfrey on 12 September 1940. The idea was to "obtain" a Nazi bomber, man it with a German-speaking crew dressed in Luftwaffe uniforms, and crash it into the English Channel. The crew would then attack their German rescuers and bring their boat and Enigma machine back to England. Much to the annoyance of Alan Turing and Peter Twinn at Bletchley Park, the mission was never carried out. According to Fleming's niece, Lucy, an official of the Royal Air Force pointed out that if they were to drop a downed Heinkel bomber in the English Channel, it would probably sink rather quickly.