The U.S. Navy sank an Iranian warship in the Indian Ocean this week, a move confirmed by Defense Secretary Pete Hegseth amid rising tensions in the region. Sri Lankan authorities recovered dozens of sailors from the water while reporting heavy casualties, and the Pentagon released declassified footage that appears to show the attack. This incident marks a rare, high-stakes show of force that has immediate implications for maritime security and regional stability.
A submarine-launched torpedo struck the vessel identified by officials as the IRINS Dena while it was transiting international waters. Sri Lankan officials said the ship was beyond their territorial sea when it sent a distress signal in the early morning hours. U.S. leaders framed the action as targeted and necessary to protect American interests and allies operating nearby.
Sri Lankan authorities put preliminary casualty estimates in the dozens, with at least 80 crew members reported killed and more than 30 rescued from the water. Local rescue teams pulled survivors to safety and moved them ashore for medical treatment, according to Sri Lankan statements. Those figures may change as search-and-rescue operations and intelligence assessments continue.
The War Department released declassified footage that appears to show a periscope breaking the ocean surface and a follow-through view of the struck ship’s stern as damage unfolds. The visuals are stark and precise, underscoring the reach and lethality of modern undersea platforms in contested waters.
Defense officials held a brief press session to confirm the engagement and to explain the rationale behind it. “An American submarine sunk an Iranian warship that thought it was safe in international waters,” he , noting it was the first such attack by the U.S. since World War II. “Instead, it was sunk by a torpedo. Quiet death.”
Sri Lankan foreign minister Vijitha Harath told parliament that the vessel, described by his office as a destroyer, issued a distress call at 5:08 A.M. local time while moving through the Indian Ocean. Sri Lanka responded in line with maritime obligations and dispatched naval and air assets to the scene. Their presence enabled a rapid search-and-rescue effort despite the chaotic aftermath of the strike.
Sri Lanka’s Navy media director Buddhika Sampath provided an on-the-ground account of the recovery operation. Sri Lanka responded to the distress call due to maritime obligations and dispatched boats for search and rescue, Sri Lankan Navy media director Buddhika Sampath said a news conference. “We found people floating on the water.”
Rescuers later confirmed the survivors were Iranian nationals and transferred them to medical facilities for treatment. Sri Lankan authorities have been coordinating with foreign representatives to determine next steps for the rescued sailors. The status of other crew members and the final toll remain under investigation as recovery teams continue to work.
The ship in question, listed as IRINS Dena in regional naval registries, had taken part in MILAN, an international exercise hosted by the Indian Navy, in the Bay of Bengal last month. That prior presence in multinational drills underscores the murky overlap between naval diplomacy and military signaling in the region. As officials piece together the timeline of the voyage, analysts will be watching how this action reshapes naval operations and deterrence calculations across the Indian Ocean.
