US Submarine Sinks Iranian Warship in the Indian Ocean: First Torpedo Sinking Since World War II Marks Dramatic Escalation in US-Israel-Iran Conflict
By: Juba Global News Network | JubaGlobal.com
March 5, 2026 – Updated 05:10 AM EST
In a striking development that has dramatically expanded the geographic scope of the ongoing US-Israel war against Iran, a United States Navy submarine torpedoed and sank an Iranian naval vessel in the Indian Ocean on March 4, 2026. The attack, confirmed by top US defense officials, represents the first time since World War II that an American submarine has sunk an enemy warship using a torpedo, underscoring the intensity and reach of Operation Epic Fury—the codename for the joint US-Israeli military campaign now in its sixth day.
US Defense Secretary Pete Hegseth announced the strike during a high-profile Pentagon briefing, describing the incident with stark imagery: “An American submarine sank an Iranian warship that thought it was safe in international waters. Instead, it was sunk by a torpedo. Quiet death.” Hegseth emphasized that the vessel was what he called Iran’s “prize ship,” highlighting the symbolic and strategic blow to Tehran’s naval capabilities.
The targeted ship has been identified by multiple sources as the IRIS Dena, a Moudge-class frigate (also referred to in some reports as a destroyer) of the Iranian Navy. Built domestically and equipped with heavy artillery, surface-to-air missiles, anti-ship missiles, and torpedoes, the IRIS Dena was one of Iran’s more modern surface combatants. It carried a crew of approximately 180 personnel. The sinking occurred in international waters roughly 40 kilometers off the southern coast of Sri Lanka, near the Galle region.
Sri Lankan authorities responded swiftly to distress signals received around 5:08 a.m. local time. The Sri Lankan Navy and Foreign Affairs Minister Vijitha Herath reported that search-and-rescue operations recovered 87 bodies from the wreckage, while more than 30 survivors (some reports specify 32) were pulled from the water. The incident has raised immediate concerns in Colombo about the spillover of Middle Eastern conflict into South Asian waters, though Sri Lanka has maintained neutrality in the escalating war.
This naval strike is part of a broader US-led effort to dismantle Iran’s maritime forces. Pentagon officials, including Chairman of the Joint Chiefs Gen. Dan Caine, stated that US forces have sunk or severely damaged over 20 Iranian vessels—including corvettes, frigates, and even a submarine—since the launch of Operation Epic Fury on February 28, 2026. Additional strikes have targeted Iran’s newest assets, such as the Shahid Soleimani-class catamaran corvette IRIS Shahid Sayyad Shirazi, which was hit and set ablaze near its home port of Bandar Abbas.
The use of a Mk-48 heavyweight torpedo—a sophisticated, wire-guided weapon known for its precision and devastating underwater explosion effect—achieved what officials described as “immediate effect,” sending the warship to the bottom rapidly. While some initial Pentagon statements claimed this as the first submarine torpedo sinking of an enemy vessel since WWII, clarifications noted that the last comparable incident involved a British submarine during the 1982 Falklands War (sinking the Argentine cruiser General Belgrano). Nonetheless, for the US Navy, this marks a rare and historic combat application of submarine-launched torpedoes in the post-WWII era.
The attack extends the conflict far beyond the Persian Gulf, Strait of Hormuz, and Levant theater. Iran’s navy, already reeling from strikes on ports like Konarak, Chabahar, and Bandar Abbas, now faces threats across multiple oceans. US Central Command (CENTCOM) has released imagery showing burning Iranian vessels, including Soleimani-class corvettes engulfed in smoke and flames.
Iranian officials have condemned the sinking as an act of “state terrorism” and vowed retaliation, warning of further disruptions to global shipping lanes and energy infrastructure. Tehran has already launched missile and drone barrages at regional targets, including in Israel, Kuwait, Saudi Arabia, Bahrain, and Turkey, while threatening to close key chokepoints if attacks continue.
The broader context of the war remains grim. The conflict began with coordinated US-Israeli strikes targeting Iranian leadership—including the assassination of Supreme Leader Ayatollah Ali Khamenei—missile sites, nuclear facilities, and IRGC assets. Casualties in Iran have surpassed 1,000, with intense bombings continuing on Tehran and other cities. Israel has expanded ground operations against Hezbollah in southern Lebanon, displacing tens of thousands, while Kurdish forces have reportedly launched ground attacks inside Iran with possible US backing.
Global repercussions are mounting. Oil prices have spiked amid fears over the Strait of Hormuz, and thousands of foreign nationals remain stranded in the region seeking evacuation. The UN and international leaders have called for urgent de-escalation, but both Washington and Tehran show no signs of backing down.
As the war enters its second week, this “quiet death” in the Indian Ocean serves as a stark reminder of how rapidly a regional conflict can spiral into a global maritime and economic crisis. Juba Global News Network will continue monitoring developments as the situation unfolds.
Search Keywords: US submarine sinks Iranian ship, IRIS Dena sinking, Indian Ocean naval clash 2026, first torpedo sinking since WWII, Operation Epic Fury, Pete Hegseth Iran war, US Israel Iran conflict March 2026, Mk-48 torpedo attack
Meta Description: A US Navy submarine torpedoes and sinks Iran’s IRIS Dena frigate in the Indian Ocean off Sri Lanka, killing at least 87 sailors—the first such US submarine sinking since WWII—as Operation Epic Fury devastates Iranian naval forces and escalates the US-Israel war on Iran.
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