was lead ship of its class, the foundation of all of Japan's kaibokan. Shimushu participated in the landings in Thailand, escorting the 55th IJA Infantry Division to landings at Nakhon on 8 December 1941. Shimushu also escorted various other invasion convoys to Malaya, Sumatra, and Palembang. Using her sonar, she located the British battlecruiser HMS Repulse on 29 January 1942, being the first ship to locate the submerged wreck. Shimushu spent more than a year on repatriation duty and was ceded to the Soviet Union on 5 July 1947.