IRIS Dena was one of Iran’s newest combat ships, and had 180 personnel on board when the submarine attacked. Reports of the Dena being in distress first emerged overnight between Mar. 3 and Mar. 4, 2026,

In a dramatic and rare naval operation, a U.S. Navy submarine fired a $4.2 million torpedo that detonated beneath an Iranian warship off the southern coast of Sri Lanka. The attack marked a historic first in modern warfare,

While the identity of the U.S. submarine was not identified for operational security, the IRIS (Islamic Republic of Iran Navy) Dena was in the region off the southern coast of Sri Lanka. The Moudge-class frigate is assigned to the Iranian Navy’s Southern Fleet and had reportedly taken part in a naval drill in the Bay of Bengal.

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.

By Parisa Hafezi, Pesha Magid and Tuvan Gumrukcu DUBAI/JERUSALEM/ANKARA, March 4 (Reuters) - The U.S.–Iran war widened sharply on Wednesday after a U.S. submarine sank an Iranian warship off Sri Lanka,

The gap between Russia and the West has pushed Moscow to prioritize unconventional capabilities, a top Norwegian military official said.

For the first time, China has outstripped U.S. nuclear-powered submarine production, an independent global security think tank recently reported—a troubling finding because whil