The Torsk’s sinking of the Japanese vessel marked the last U.S. submarine kill for over eight decades — that is until March 3 ...

The downing of the Iranian frigate IRIS Dena marks the first time an American submarine has destroyed an enemy warship in decades.

U.S. submarine sinks Iranian warship near Sri Lanka in historic Indian Ocean strike. First enemy ship destroyed by torpedo since World War II.

A single Mk-48 torpedo achieved "immediate effect" on an Iranian frigate, which was operating in the Indian Ocean, the Pentagon confirmed.

This story has been updated with additional information from U.S. Central Command about the sinking of an IRGCN corvette. An ...

Since 1991, Navy subs have launched scores of cruise missiles in combat, but the torpedo attack off Sri Lanka is a return to form after 80 years.