The U.S. Navy auxiliary motor minesweeper USS YMS-143 when new in February 1943. Secretly transferred to the Soviet Navy on 17 May 1945 during Project Hula, she became T-522 and took part in the Soviet conquest of the Japanese province of Karafuto on southern Sakhalin Island between 11 and 25 August 1945. T-522 served in the Soviet Navy until stricken in July 1956 and dismantled for spare parts.[1]
Auxiliary motor minesweepers were small wood-hulled minesweepers commissioned by the United States Navy for service during World War II. The vessels were numbered, but unnamed. The auxiliary motor minesweepers were originally designated yard minesweepers (YMS) and kept the abbreviation YMS after being re-designated. The type proved successful and eventually became the basis for the AMS type of United States Navy minesweeper.
- ^ Russell, Richard A., Project Hula: Secret Soviet-American Cooperation in the War Against Japan, Washington, D.C.: Naval Historical Center, 1997, ISBN 0-945274-35-1, p. 29.