The Iranian warship IRIS Dena sank on March 4, 2026, after being struck by a U.S. torpedo in the Indian Ocean near Sri Lanka. This incident has raised significant tensions between Iran and the United States.

Immediate Circumstances

Following the sinking, the Sri Lankan navy successfully rescued 32 sailors and recovered 87 bodies from the waters. The U.S. Indo-Pacific Command has rejected Iran’s assertion that the IRIS Dena was unarmed at the time of the attack, which has led to conflicting narratives regarding the ship’s operational status.

Prior to its sinking, the IRIS Dena was participating in an international naval exercise in India. Iranian officials, including Deputy Foreign Minister Saeed Khatibzadeh, claimed that the warship was operating in a non-combat role, stating, “That vessel was by invitation of our Indian friends, attending an international exercise. It was ceremonial. It was unloaded. It was unarmed.” However, an Indian navy official contradicted this, noting that the vessel was not “entirely unarmed” during the exercises.

U.S. Defense Secretary Pete Hegseth described the IRIS Dena as a “prize ship” that “died a quiet death,” emphasizing the strategic implications of the incident. The sinking has highlighted ongoing tensions between the U.S. and Iran, extending conflicts beyond the Middle East.

Details remain unconfirmed, as both nations continue to dispute the circumstances surrounding the sinking of the IRIS Dena.

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