Reuters reported that Sri Lankan rescuers recovered 87 bodies and pulled 32 survivors from the water after responding to a distress call near Galle. At the Pentagon’s March 4 briefing, Chairman of the Joint Chiefs Gen. Dan Caine said a U.S. Navy fast-attack submarine used a single Mark 48 torpedo, calling it the first American torpedo sinking of an enemy combatant ship since 1945.
Defense Secretary Pete Hegseth described the attack as a “quiet death,” while Sri Lankan navy spokesman Commander Buddhika Sampath said rescuers found “people floating in the water.” AP reporting from Galle showed bodies arriving at a hospital morgue and said the ship carried about 180 people when the distress signal was sent.
How the Iran war reached Sri Lanka’s coast
A Reuters explainer on the ship’s final movements said the Dena had been returning from India’s MILAN 2026 naval exercise and went down about 19 nautical miles off Galle, inside Sri Lanka’s exclusive economic zone but outside territorial waters. That placed the sinking far from the Gulf battleground that defined the opening days of the war and instantly widened the maritime map of the conflict.
Iran said the ship was struck without warning, and the aftermath was political as well as military. Reuters later reported that Washington pressed Colombo not to repatriate survivors from the Dena or the crew of a second Iranian vessel that entered Sri Lankan custody, showing how quickly the torpedo strike turned into a regional diplomatic problem for Sri Lanka and India as well as a battlefield success for Washington.
A longer naval history behind the strike
The Dena had already become a symbol of Iran’s attempt to operate farther from home waters. Reuters reported in 2023 that the frigate docked in Rio de Janeiro despite U.S. pressure on Brazil, one of the clearest signs that Tehran wanted its navy seen well beyond the Persian Gulf.
The sinking also revived memories of Operation Praying Mantis, recounted by the U.S. Naval Institute in 2013, when the United States struck Iranian naval targets in 1988 after the mining of USS Samuel B. Roberts. That fight was the last major U.S.-Iran naval clash of this scale, and it gives the loss of the Dena a longer historical echo than the day’s headlines alone suggest.
Why the Iran war now matters to Indian Ocean ports
For India, Sri Lanka and other regional governments, the lesson is immediate. A warship that had just left a multinational exercise off India was destroyed near Sri Lanka days later, forcing both countries into rescue, port-access and repatriation decisions they did not choose. The strike showed that the Iran war can no longer be described only through the Gulf, Israel or Iran’s own coastline.
That is what makes the sinking off Sri Lanka more than a tactical milestone. It was a demonstration of reach, a reminder of the vulnerability of naval movements outside the main combat zone and a signal that neutral ports and nearby shipping lanes can be dragged into the fallout with almost no warning.
