US Submarine Strike in Indian Ocean Brings Iran War to Asia
A US Navy submarine sank the Iranian frigate IRIS Dena in the Indian Ocean on March 3-4, 2026, about 40 nautical miles off Sri Lanka’s southern coast, marking the first US torpedo sinking of an enemy ship since World War II. This strike, confirmed by Defense Secretary Pete Hegseth, extends the ongoing US-Iran war—sparked by joint US-Israel attacks on Iran starting February 28—into Asian waters.
The IRIS Dena, a Moudge-class frigate from Iran’s Southern Fleet, had recently joined India’s MILAN naval exercise in Visakhapatnam before heading home. A single Mk-48 torpedo from an undisclosed US fast-attack submarine caused an explosion and rapid sinking; Sri Lanka rescued 32 crew, but over 87-100 remain missing or dead. Pentagon video showed the hit, dubbed a “quiet death” in international waters.
The attack follows massive US-Israel airstrikes destroying Iranian missile sites, air defenses, and over 1,700 targets since late February, amid Iran’s retaliatory drone and missile strikes on US assets. President Trump has vowed to annihilate Iran’s navy, with US operations now spanning the Indo-Pacific. Iran claims retaliation, including missile hits on a US oil tanker in the Persian Gulf and threats to the Strait of Hormuz.
India aided rescue with patrol aircraft and life rafts after the distress call, coordinating with Sri Lanka, but faces criticism for hosting the “unarmed” ship recently. The event strains India-US ties amid Trump’s tariffs (partially eased) and raises alarms over Indian Ocean security, oil routes, and China’s influence. Sri Lanka urges peace to avoid entanglement, while Iran calls it an “atrocity” against its New Delhi visit.
