Torpedo Strike Sinks Iranian Frigate Dena off Sri Lanka

Torpedo Strike Sinks Iranian Frigate Dena off Sri Lanka Coast

Situation Update

Dramatic footage circulating on Russian and Middle Eastern Telegram channels captures the moment a torpedo reportedly fired from a US submarine strikes the Iranian frigate Dena in the Indian Ocean off the coast of Sri Lanka. The video shows a massive water column erupting from the hull, followed by rapid listing as the vessel begins to sink.

Sri Lanka Deputy Foreign Minister confirmed to local media that at least 80 crew members were killed when the warship was struck. The ship had reportedly been returning to Iran from a port call in eastern India when it was intercepted.

80+ crew members killed in the torpedo strike on IRIS Dena, per Sri Lankan officials

Naval Escalation

The sinking of the Dena represents a significant escalation in the naval dimension of the US-Iran conflict. The frigate, a Mowj-class vessel commissioned in 2021, was one of the more modern surface combatants. Its destruction in the Indian Ocean, far from the Persian Gulf theater, signals that US forces are hunting Iranian naval assets across multiple oceans.

The engagement also marks one of the first confirmed submarine torpedo attacks on a surface combatant since the Falklands War in 1982, when a British submarine sank the Argentine cruiser ARA General Belgrano.

Shrinking Fleet

With the Dena loss, Iranian naval casualties in the conflict have reportedly reached 20 vessels including corvettes, patrol boats, and now a modern frigate. While fast-attack craft and the submarine fleet remain largely intact within the Persian Gulf, the ability to project naval power beyond the Strait of Hormuz has been effectively eliminated.

20 Iranian naval vessels reported sunk or disabled since the conflict began

What Comes Next

The Indian Ocean engagement raises questions about remaining blue-water naval assets and whether Tehran will attempt to resupply or reinforce its distant deployments. For the US Navy, the successful submarine attack validates a doctrine of hunting enemy surface ships far from contested waters.