Silent U.S Sub KILLS Iranian Warship — First Since WWII

A silent U.S. submarine delivered a torpedo that sent an Iranian frigate to the ocean floor—the first enemy warship sunk this way since World War II.

Story Snapshot

U.S. Navy submarine sinks Iranian frigate IRIS Dena with one Mk-48 torpedo on March 3, 2026, off Sri Lanka.
Part of Operation Epic Fury, destroying over 20 Iranian vessels and 2,000 targets total.
Pentagon announces historic first post-WWII submarine kill on March 4, 2026.
32 Iranian crew rescued by Sri Lanka; 148 unaccounted for from 180 aboard.
Claims of seven fast boats and Iranian attacks on South Korean ship or UAE unverified.

Submarine Strike Sinks Iranian Frigate

US Navy fast-attack submarine fired a single Mk-48 torpedo at the Iranian Moudge-class frigate IRIS Dena in the Indian Ocean off Sri Lanka on March 3, 2026. The torpedo struck with immediate effect, sinking the vessel during its transit from Bay of Bengal drills. This marked the first confirmed submarine sinking of an enemy warship since World War II. Pentagon leaders hailed the precision strike as a demonstration of American technological superiority in stealth operations.

Pentagon Confirms Operation Epic Fury Success

Defense Secretary Pete Hegseth and Joint Chiefs Chairman Gen. Dan Caine briefed on March 4, 2026. They detailed how U.S. forces hit nearly 2,000 Iranian targets, including over 20 naval vessels. Carrier strike groups like USS Gerald R. Ford supported the campaign, squeezing Iranian ports. Operations continued for 24-48 hours, effectively neutralizing Iran’s major naval presence in the region. Video and photos of the torpedo strike released publicly.

Historical Precedent in US-Iran Naval Clashes

Iran’s navy has long relied on fast-attack boat swarms to harass U.S. ships, echoing tactics from the 1988 Operation Praying Mantis. There, U.S. forces sank Iranian frigates and fast boats in retaliation for mine attacks in the Persian Gulf. Recent incidents show Iranian speedboats charging U.S. destroyers at 50 knots without radio contact. Operation Epic Fury counters this asymmetric threat with overwhelming precision strikes, aligning with conservative principles of strong deterrence.

Sri Lankan navy rescued 32 survivors from the 180 crew on IRIS Dena, possibly named after Qasem Soleimani killed in 2020. The U.S. withheld the submarine’s identity for operational security. This event disrupts Iranian power projection via its Southern Fleet, securing vital Indian Ocean shipping lanes.

Strategic Impacts on Regional Power Balance

Short-term, Iran’s navy suffers crippling losses, reducing immediate threats to commercial shipping. Long-term, the strike validates Mk-48 torpedo dominance and sets a precedent for submarine warfare against swarm tactics. Political fallout humiliates Iran, boosting U.S. deterrence credibility. Economic effects secure oil trade routes, while crew losses erode Iranian military morale. Broader tensions rise in Indo-Pacific and Middle East, affecting global sectors.

Query claims of U.S. Navy sinking seven specific fast boats during Iranian assaults on a South Korean cargo ship and UAE targets lack confirmation. Sources describe one frigate plus unspecified vessels in a larger air-missile campaign. This mismatch suggests exaggeration, but verified facts underscore U.S. resolve against aggression—common sense demands clear strength to prevent escalation.