n February 20, together with her sister ship Arashio, she was attacked by USS Albacore (SS-218) off Wewak, New Guinea. Ōshio was hit by a torpedo, which flooded her engine room and killed eight crewmen. Arashio attempted to tow her, but her keel was fatally damaged, and she sank approximately 70 nautical miles (130 km) northeast of Manus Island at position 00°50′S 146°06′E