Frigate OBLITERATED—80 Sailors Dead, 100 Missing

American flag and submarine at sea under a cloudy sky.

A U.S. Navy submarine has achieved what no American sub has accomplished in 81 years: sinking an enemy warship with a torpedo, obliterating an Iranian frigate in the Indian Ocean and sending a message that American military might reaches far beyond our shores.

Story Highlights

U.S. fast-attack submarine sinks Iranian frigate IRIS Dena with Mark 48 torpedo on March 3, 2026, marking first American submarine torpedo kill since 1945
Attack killed at least 80 Iranian sailors with 100 missing as part of Operation Epic Fury that has destroyed over 20 Iranian naval vessels
Defense Secretary Pete Hegseth declares Iranian Navy “combat ineffective” with no operational ships remaining in Persian Gulf waters
Strike demonstrates U.S. submarine global reach, tracking Iranian vessel 20 nautical miles south of Sri Lanka in international waters

Historic Submarine Strike Neutralizes Iranian Threat

The U.S. Navy submarine struck the Iranian Moudge-class frigate IRIS Dena on Tuesday, March 3, 2026, in international waters of the Indian Ocean. Pentagon-released infrared footage shows a massive stern detonation that led to the vessel’s rapid sinking. The Mark 48 torpedo detonated beneath the keel, causing catastrophic structural failure. This represents the first U.S. submarine-launched torpedo kill of an enemy vessel since USS Torsk sank Japanese ships in World War II, and only the second nuclear-powered attack submarine combat kill in history after Britain’s HMS Conqueror in 1982.

Operation Epic Fury Decimates Iranian Naval Power

Defense Secretary Pete Hegseth confirmed the strike as part of Operation Epic Fury, launched February 28, 2026, targeting Iran’s naval assets, missile facilities, and security infrastructure. The campaign has neutralized 17 to 20 Iranian vessels according to Pentagon briefings, with CENTCOM Commander Admiral Brad Cooper reporting the operation is ahead of schedule. General Dan Caine, Chairman of the Joint Chiefs, emphasized the mission’s objective to obliterate Iran’s missiles, drones, and naval capabilities. The Iranian Navy now has no ships underway in critical waterways including the Arabian Gulf, Strait of Hormuz, and Gulf of Oman.

Deadly Consequences and Strategic Impact

The IRIS Dena carried approximately 180 crew members when struck. Sri Lankan authorities recovered 32 survivors but confirmed at least 80 deaths with around 100 sailors still missing. The frigate was returning from the 2026 International Fleet Review in Visakhapatnam, India, when targeted. The submarine, whose identity remains classified for operational security reasons, tracked the Iranian vessel from Gulf waters into the Indo-Pacific region. This demonstrates American submarine operational range that extends well beyond traditional CENTCOM theaters, a capability that should concern any adversary contemplating aggression against U.S. interests or allies.

Restored Security and Deterrence

The destruction of Iran’s naval capability directly addresses decades of Iranian harassment of international shipping through critical maritime chokepoints. President Trump confirmed the elimination of nine Iranian naval vessels early in the operation, promising to sink any remaining ships. The campaign has struck approximately 2,000 targets with equal munitions, effectively rendering Iran’s ability to threaten commercial shipping and U.S. forces obsolete. This swift degradation of Iranian military power restores security for regional partners and demonstrates American resolve under leadership willing to protect constitutional priorities including national defense. Admiral Cooper noted forces continue hunting remaining Iranian missile launchers, ensuring complete neutralization of threats to American personnel and allies.

U.S. Sub Sinks Iranian Warship, First Such Hit Since WWIIhttps://t.co/5BRhiFbqFe

— PJ Media (@PJMedia_com) March 4, 2026

The operation represents a decisive reassertion of American military dominance after years of constrained rules of engagement. Iran’s attempt to project power through naval intimidation and support for terrorism has met overwhelming force, vindicating the principle that peace comes through strength. With Iran’s navy now resting at the bottom of the ocean and its ability to develop nuclear weapons severely compromised, the region faces a fundamentally altered strategic landscape favoring stability and American interests.