This story has been updated with additional information from U.S. Central Command about the sinking of an IRGCN corvette. An American attack submarine sank an Iranian Navy ship off the coast of Sri Lanka,

"It’s almost certain that Electric Boat contributed to its manufacturing in whole or in part,” Sen. Richard Blumenthal.

The Pentagon has not said which American submarine fired the torpedo, except to say it was a fast-attack submarine.

To this day, there has only been one recorded instance of submarine-on-submarine warfare during WWII. The German Navy's destroyed U-864 is toxic to this day.

Beijing is working to ramp up production of nuclear-powered attack boats and incorporate larger numbers of guided-missile classes into its submarine force, putting the People’s Liberation Army Navy on the path to credibly challenge U.

In 1942, a German U-boat torpedoed the British liner Laconia — only to discover it carried Allied prisoners of war. In an extraordinary act, the submarine surfaced and began rescue operations. What followed was chaos,

The sinking of Iran's IRIS Dena by a US submarine marked a significant event, with Defence Secretary Pete Hegseth calling it the first enemy ship sunk by a torpedo since WWII. This incident raised troubling questions about the ethics of warfare,

Search ends for survivors of New Bedford fishing vessel that sank off Cape Cod, killing 2 The search was called off for any survivors after a New Bedford-based fishing vessel with two people aboard sank off Cape Cod, the Coast Guard said. Fans react to ...