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

The Iranian warship that was sunk in the Indian Ocean likely didn’t have the technology needed to defend itself against ...

For the first time, China has outstripped U.S. nuclear-powered submarine production, an independent global security think ...

China has ramped up its production of nuclear-powered submarines over the past five years to the point where it is launching subs faster than the United States, threatening to negate a sea-power ...

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

The ocean is a vast, enigmatic frontier that remains largely unexplored. Its depths are a realm of crushing pressure, freezing temperatures, and total darkness – a hostile environment few would dare ...