At around 12:00, a second "Kaibōkan" arrived in the area to hunt for "Torsk"; the latter fired a second Mark 28 torpedo and then dove deep to evade any depth charge attacks. After reaching a depth of , she launched a Mark 27 torpedo, a passive acoustic torpedo. Shortly thereafter, the hydrophone operator detected a large explosion; this was the Mark 28 striking the "Kaibōkan", and a minute later the Mark 27 struck the vessel as well. This proved to be the last Japanese warship to be sunk in World War II, as the Japanese government announced it would surrender the next day. Additional patrol vessels arrived in the area, and their presence, coupled with that of patrol aircraft, compelled "Torsk" to remain submerged for more than seven hours. She then surfaced and proceeded toward the Noto Peninsula. After receiving word of Japan's surrender on 15 August, "Torsk" continued patrolling the Sea of Japan, conducting surveillance of Japanese installations and destroying any naval mines she encountered. On 1 September, she departed the area for the Marianas Islands, passing through the Tsushima Strait two days later, and arriving in Guam on 9 September, concluding her second patrol.