On 12 August she was sent from Surabaya on a rescue and resupply mission to Korim Bay. She arrived on 18 August and after unsuccessfully attempting to contact the troops at Korim Point came under attack by three subchasers. She was heavily depth-charged and developed a major leak to her engine room. Ten hours after the attack began she surfaced and headed to Ambon for temporary repairs arriving there on 23 August. She then returned to the Sasebo Naval Arsenal for repair and an overhaul. Lt Cdr Ono Yasushi took over command and she was reassigned to Submarine Division 19 as training ship.