Imperial Japanese Navy had around 250 submarine chasers in World War II, principally about 200 of the No.1-class auxiliary submarine chasers. Some of these survived to serve in the Japan Maritime Self Defense Force (JMSDF) after the war. During Project Hula, the United States secretly transferred 32 U.S. Navy submarine chasers to the Soviet Union between 26 May and 2 September 1945, and some of these saw action in the Soviet Navy during Soviet military operations against the Japanese between 9 August and 2 September 1945. The transfer of 24 more was canceled when transfers halted on 5 September 1945, three days after the Japanese surrender. Between 1954 and 1960 all 32 transferred submarine chasers were scrapped by the Soviet Union or destroyed off its coast by mutual agreement between the two countries. Post-war In the decade immediately after World War II, the Soviet Union built 227 Kronshtadt-class submarine chasers, some of which remained in active service until the 1990s. Rapid developments in submarine technologies since World War II mean that submarine chasers are now obsolete, having been replaced by corvettes, frigates, and destroyers. Survivors The only remaining submarine chaser with intact World War II armament is the Royal Norwegian Navy's HNoMS Hitra, which is a touring museum today. A World War II type submarine chaser built in 1953, originally PC1610, is being restored in the Netherlands as Le Fougueux. See also Harbour Defence Motor Launch List of Escorteurs of the French Navy List of patrol vessels of the United States Navy Wooden boats of World War II Citations General bibliography Gardiner, Robert, Conway's All the World's Fighting Ships 1906–1921 Conway Maritime Press, 1985. . Gardiner, Robert and Chesneau, Roger, Conway's All the World's Fighting Ships 1922–1946, Conway Maritime Press, 1980. . Watts, Anthony J., Japanese Warships of World War II, Doubleday, 1966. . External links Subchaser Archives a site dedicated to US World War I subchasers. Subchasers at Ships of the U.S. Navy, 1940–1945 Military boats Submarine chaser