Kammala jumla mai zuwa: A ranar 5 ga Disamba, 1941, "I-66" ya bar Samah don fara abin da zai zama na farko na yakin basasa. Lokacin da
Harin Japan na Malaya ya fara ne a ranar 8 ga Disamba, 1941 <unk> ranar farko ta Yaƙin Duniya na II a Gabashin Asiya <unk> "I-66" yana cikin Tekun Kudancin China daga Trengganu, Malaya ta Burtaniya, yana aiki a kan layin sintiri tare da jiragen ruwa,,, da. A ranar 15 ga Disamba, 1941, "I-66" da "I-65" sun rabu da wannan aikin don gudanar da bincike na hanyoyin zuwa Kuching don tallafawa mamayewar Sarawak a Arewacin Borneo na Burtaniya, wanda ya fara a ranar 16 ga Disamba, 1941. Jirgin ruwa biyu sun karbi gargadi cewa jiragen ruwa na Allied suna aiki a Kuching. Yayin da yake shirin fitowa don sake cajin batirinsa a arewa maso yammacin Kuching a ranar 24 ga Disamba, 1941, "I-66" ya ga jirgin ruwa na Royal Netherlands Navy a kan farfajiyar a kan farfajiyar farfajiyarta a nesa da. Bayan da aka yi amfani da shi a karkashin ruwa, "I-66" ya kori torpedo daya a 10:28. Ya buga "K XVI", wanda ya karya a cikin biyu kuma ya nutse tare da asarar dukan ma'aikatansa 36. A ranar 4 ga Oktoba, 2011, masu ruwa na Australiya sun gano jirgin ruwa na "K XVI", ya rushe a rabi kuma a zurfin.