U.S. Strikes Iranian Frigate in Indian Ocean: First Submarine Torpedo Sinking Since WWII

 In a dramatic escalation of the U.S.-led campaign against Iran, a U.S. Navy submarine has torpedoed and sunk an Iranian warship in the Indian Ocean, marking the first such submarine-launched torpedo destruction of an enemy vessel by American forces since the end of World War II.

The targeted ship, identified by the Pentagon as the IRIS Dena—a Moudge-class frigate and one of the Iranian Navy's more advanced surface combatants—was struck late Tuesday in international waters approximately off Sri Lanka's southern coast. Defense Secretary Pete Hegseth announced the incident during a Wednesday briefing at the Pentagon, releasing declassified video footage captured from the attacking submarine's periscope.

"An American submarine sunk an Iranian warship that thought it was safe in international waters," Hegseth stated. "Instead, it was sunk by a torpedo. Quiet death. The first sinking of an enemy ship by a torpedo since World War II."

Chairman of the Joint Chiefs of Staff Gen. Dan Caine confirmed that a single Mk-48 heavyweight torpedo achieved "immediate effect," causing catastrophic damage to the frigate's hull and sending it to the bottom within minutes. The Mk-48, a precision-guided weapon widely regarded as one of the most effective in the U.S. arsenal, demonstrated its lethality against a modern warship operating far from Iran's home waters.

The strike is part of the expanding Operation Epic Fury, which U.S. officials say has already degraded Iranian missile and drone capabilities significantly in recent days through coordinated strikes with Israel. The operation follows a series of Iranian attacks on regional targets and comes amid vows from Washington and Tel Aviv to dismantle key elements of Iran's military infrastructure.

Sri Lanka's navy responded swiftly to a distress signal from the sinking vessel, launching rescue operations that recovered 32 survivors—many requiring medical treatment for injuries and exposure—and retrieved 87 bodies from the wreckage and surrounding waters. Iranian naval sources have not yet issued an official casualty figure, but the frigate was reported to have a complement of about 180 personnel. The incident has raised concerns about the safety of international shipping lanes in the region, though no civilian vessels were reported affected.

Pentagon officials emphasized that the IRIS Dena was operating in international waters and posed a potential threat in the context of ongoing hostilities. The attack underscores the reach of U.S. undersea power projection, with the submarine—identity classified—able to strike undetected at long range.

Iran has condemned the action as an "act of aggression" and vowed retaliation, while international observers warn of risks for further escalation in already volatile waters. The U.S. maintains that the operation is defensive in nature, aimed at protecting allied interests and deterring further Iranian provocations.

As the conflict enters its next phase, military analysts note that this rare submarine victory revives memories of the Pacific theater in WWII, where U.S. subs inflicted heavy losses on enemy fleets. For now, the "quiet death" in the Indian Ocean serves as a stark reminder of the evolving nature of modern naval warfare.