Rambai muchinyora ndima iyi - Musi wa7 December 1941, "I-121" yakaisa zvimbambaira makumi mana nezviviri zveType 88 Mark 1 kuchamhembe kwakadziva kumabvazuva kweSingapore munharaunda ye Akabva atanga kufamba achitenderera kumabvazuva kweJohore Strait. MuEast Asia, Hondo Yenyika II yakatanga pana 8 December 1941, uye mauto eJapan akapinda mu
British Malaya kuchamhembe kweSingapore zuva iroro. Yakagoverwa kuSouthern Submarine Force, yakasvika kuCam Ranh Bay muJapan-yakagarwa neFrench Indochina musi wa12 Zvita 1941, ndokuzodzoka munzira zuva rimwe chetero kutsigira kupindirwa kweJapan kwePhilippines, yakananga kunharaunda yeDavao kuMindanao. Akatsigira maJapan paDavao musi wa19-20 December 1941 uye paJolo musi wa24 December 1941. Yakagoverwazve kuSubmarine Group "A" pamwe chete ne "I-122", "I-123", uye "I-124" musi wa 26 Zvita 1941, akapedzisa kufamba kwake musi wa 27 Zvita 1941 nekusvika kwake kuDavao ichangobva kutorwa.