In May 1945, British sailors from HMS Otway recovered an Enigma machine from the Kleiner Walsertasee (Lake) in Austria, where it had been thrown by German soldiers to prevent capture. It was found at a depth of 77 meters. This recovery was not publicized because Bletchley Park wanted the world to believe the Enigma had been broken by mathematical genius, not that physical machines had been captured and decoded. In fact, the ability to read German naval Enigma traffic in 1942-1943 depended almost entirely on recovered codebooks and machines, not cryptanalysis alone. The lake recovery in Austria yielded not only the machine but also cryptographic keys that allowed British codebreakers to read U-boat communications for months.