British code-breakers were able to decrypt some of the German signals, including an order to the Luftwaffe to provide support for Bismarck making for Brest, decrypted by Jane Fawcett on 25 May 1941.
英国的密码破译员能够解密部分德国信号，其中包括一条要求德国空军为俾斯麦号提供掩护而前往布雷斯特的命令，由简·福西特（英语：Jane Fawcett）于1941年5月25日解密。