USS Blackfin (SS-322) was a submarine of the United States Navy. On her second war patrol she was in the Gulf of Siam. There she torpedoed Shigure, which was escorting a convoy.
The loss of Shigure is dated 24 January 1945. Blackfin fired the torpedo. One torpedo hit, and Shigure sank. Most of Shigure’s crew survived.
Blackfin survived the war. The sinking of Shigure on 24 January 1945 is the action recorded for her.