Rubuta ci gaba don wannan sakin layi - A ranar 7 ga Disamba, 1941, "I-121" ya sanya mines na Type 88 Mark 1 guda arba'in da biyu a arewa maso gabashin Singapore a kusa da. Daga nan sai ta dauki tashar sintiri a gabashin ƙofar Johore Strait. A Gabashin Asiya, Yaƙin Duniya na II ya fara a ranar 8 ga Disamba, 1941, kuma sojojin Japan sun mamaye
British Malaya zuwa arewacin Singapore a wannan rana. An sake sanya shi zuwa Sojojin Ruwa na Kudancin Kudancin, ya kira Cam Ranh Bay a cikin Indochina na Faransa da Japan ta mamaye a ranar 12 ga Disamba, 1941, sannan ya sake komawa a wannan rana don tallafawa mamayewar Japan na Philippines, wanda ke kusa da Davao a Mindanao. Ta goyi bayan saukowar Jafananci a Davao a ranar 19 zuwa 20 ga Disamba 1941 da Jolo a ranar 24 ga Disamba 1941. An sake sanya shi zuwa Rukunin Jirgin Ruwa "A" tare da "I-122", "I-123", da "I-124" a ranar 26 ga Disamba, 1941, ta kammala aikinta a ranar 27 ga Disamba, 1941 tare da isowarta a Davao da aka kama.