The first message decrypted proved to have been U-boat communication from North Atlantic encrypted with 4-rotor Enigma, giving credence to the speculation about their encryption method.

• 第一个被解密的消息被证明是由活动在北大西洋上的U型潜艇用4转子加密机加密后发送的，这说明了他们解密方法的正确性。