At 5:08 in the morning of March 4, 2026, a distress call crackled out from a position roughly 40 nautical miles south of Galle, Sri Lanka. By the time Sri Lankan naval vessels reached the coordinates, IRIS Dena, an Iranian Moudge-class frigate, commissioned in 2021, carrying approximately 180 sailors had already vanished beneath the Indian Ocean. What remained were spreading oil slicks, floating debris, and men treading water far from shore. The US government later confirmed, with apparent pride, that one of its nuclear-powered attack submarines had fired a single Mark 48 torpedo at the vessel.