The sinking of the Iranian warship IRIS Dena on 4 March 2026 marked one of the most significant naval incidents in the expanding conflict between the United States and Iran. The event occurred in the Indian Ocean, off the southern coast of Sri Lanka near the port city of Galle, and represented a major escalation of the war beyond the Middle East. IRIS Dena was one of the most advanced warships operated by the Islamic Republic of Iran Navy. Commissioned in 2021, the ship belonged to the Moudge-class of frigates and was equipped with anti-ship missiles, surface-to-air missiles, naval guns, torpedoes, and a helicopter deck. It was designed for long-range missions and international deployments, allowing Iran to project naval presence far from its coastline. In early 2026, the ship participated in multinational naval exercises hosted by India in the Bay of Bengal and later began its return jo

Source: How the USS Charlotte (SSN – 766) sinks the IRIS Dena using Mark 48 heavyweight torpedo