Ka kammala wannan magana: A shekara ta 1939, ta yi gagarumar nasara a cikin JN-25, lambar aiki na jirgin ruwan Japan da aka yi amfani da ita don mafi mahimmancin saƙonni. Ta sami nasarar warware ɓangaren cipher na tsarin "5-num" wanda ke amfani da rukunin lambobi a matsayin maye gurbin kalmomi da lambobi wanda aka ƙara ɓoye shi da lambar dijital. Bayan haka, Sojojin Ruwa na iya karanta wasu sakonnin da aka tsara, kamar rahotannin yanayi, amma yawancin sakonnin sun kasance ba a gano su ba. Wannan aikin daga baya ya ci gaba da amfani da shi bayan harin da aka kai a kan Pearl Harbor don sauran yakin Pacific kuma ya ba da gargadi na gaba game da hadarin.
Harin Japan a kan Midway Atoll. Ba ta iya shiga cikin wannan aikin ba saboda, a watan Oktoba na 1940, an canza ta zuwa ƙungiyar da ke aiki don karya lambar Enigma na jirgin ruwan Jamus.