US Submarine Torpedoes Iranian Warship IRIS Dena Near Sri Lanka — 87 Confirmed Dea

The IRIS Dena, an Iranian Moudge-class frigate, was sunk by a US submarine torpedo attack in international waters off Sri Lanka’s southern coast on March 4, 2026. US Defense Secretary Pete Hegseth confirmed the strike, calling it a “quiet death” and the first US torpedo sinking of an enemy vessel since World War II.

This incident escalates the Iran-US conflict into the Indian Ocean, shortly after the warship’s participation in India’s Milan naval exercise.

Incident Overview

Sri Lankan Foreign Minister Vijitha Herath reported that the navy received a distress call from the IRIS Dena, carrying about 180 personnel, prompting a search-and-rescue operation with air force support. By the time Sri Lankan vessels arrived, only an oil slick and life rafts remained, with navy spokesman Commander Buddhika Sampath confirming the site’s location outside territorial waters.

Rescue teams recovered 87 bodies, saved 32 survivors (some critically injured), and left around 60 missing, according to varying reports from officials and Reuters. Health ministry official Dr. Anil Jasinghe noted one survivor in critical condition and seven under emergency care.

Casualties and Rescue Statistics

Category Number Reported Source Notes Total Onboard 180 Sri Lankan Foreign Minister Bodies Recovered 87 Navy confirmed Rescued 32 (78 wounded incl. 32 serious in some reports) Includes minor injuries; 101 missing per Reuters variant Missing ~60 Ongoing search Critical Cases 1 rescued; 7 emergency Health ministry

The frigate, one of Iran’s newest deep-water patrol ships armed with missiles, torpedoes, and a helicopter, had just returned from India’s Bay of Bengal drill (Feb 18-25, 2026). Hegseth described it as Iran’s “prize ship,” targeted amid broader US efforts against Tehran’s military.

Strategic Context

The attack widens West Asia tensions into India’s strategic backyard, raising international law questions from former US officials about strikes in international waters. Iran views the IRIS Dena’s loss as a blow to its naval capabilities, while the Trump administration signals deeper strikes. Sri Lanka’s response focused on humanitarian aid, unloading bodies in Galle.

This event underscores vulnerabilities in naval operations post-multinational exercises, with the US leveraging submarine stealth for precision strikes—Hegseth emphasized the torpedo’s silent efficiency.

Broader Implications

The sinking disrupts Iran’s regional power projection, potentially straining India-Sri Lanka relations due to proximity and recent joint drills. Casualty figures highlight the human cost: 87 confirmed dead represent nearly half the crew, with missing personnel likely lost to the Indian Ocean’s depths. Economically, oil slicks signal environmental risks, though no major spill reported yet.

Conclusion

The IRIS Dena tragedy marks a perilous escalation, blending high-seas warfare with rescue heroism—Sri Lanka’s swift action saved lives amid geopolitics. With 87 dead and tensions rising, diplomatic fallout looms, urging restraint to prevent wider conflict. Global navies must reassess international water safety in an era of silent torpedoes.

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