A dramatic naval confrontation unfolded in the Indian Ocean after reports of an Iranian submarine-related attack triggered a rapid U.S. military response. According to defense officials, American naval units detected the underwater threat and launched counter-measures within minutes, leading to a short but intense maritime engagement.

During the escalation, a U.S. submarine fired a torpedo that sank the Iranian warship IRIS Dena near the coast of Sri Lanka, marking one of the rare modern naval sinkings involving submarines. The vessel reportedly went down within minutes of the strike, with dozens of sailors killed and rescue operations launched shortly afterward.

Pentagon officials described the operation as part of the wider Operation Epic Fury campaign, aimed at weakening Iran’s naval and missile capabilities. Analysts say the incident significantly expanded the conflict beyond the Persian Gulf, highlighting how quickly maritime tensions can escalate during the ongoing U.S.–Iran war.

Iran condemned the attack and warned that the United States would face consequences, raising fears that further naval confrontations could threaten global shipping routes and energy supplies, especially near the Strait of Hormuz, one of the world’s most critical oil transit chokepoints.