US submarine sank Iran’s warship off Sri Lanka coast, says Hegseth
On March 4, 2026, a United States submarine reportedly sank an Iranian warship, the IRIS Dena, in international waters off the coast of Sri Lanka. According to US Defense Secretary Pete Hegseth, this was the first US attack on an enemy warship since World War II.

Briefing Summary
AI-generatedOn March 4, 2026, a United States submarine reportedly sank an Iranian warship, the IRIS Dena, in international waters off the coast of Sri Lanka. According to US Defense Secretary Pete Hegseth, this was the first US attack on an enemy warship since World War II. The Iranian frigate, with approximately 180 crew members, was returning from a fleet review in India when it sent a distress call about 40 nautical miles from Galle, Sri Lanka. Sri Lankan authorities have recovered bodies and rescued 32 wounded sailors, but at least 80 are reported dead. A search and rescue operation is underway to find the remaining crew members, while the cause of the sinking, according to the US, was a torpedo strike.
Article analysis
Model · rule-basedKey claims
5 extractedThe Iranian frigate IRIS Dena sent out a distress call between 6am and 7am (00:30 to 01:30 GMT) on Wednesday.
Sri Lanka recovered several bodies and rescued 32 wounded sailors after an Iranian military ship sank just outside the island’s territorial waters.
The strike on the Iranian warship was the “first such attack on an enemy since World War II”.
A United States submarine has sunk an Iranian warship with a torpedo in international waters off Sri Lanka’s coast.
At least 80 people were killed in the strike.