On March 4, 2026, a United States Navy submarine fired a torpedo that struck the Iranian frigate IRIS Dena, sinking it in international waters about forty nautical miles off Galle in southern Sri Lanka. The attack occurred during the wider conflict involving the United States, Israel and Iran, which intensified after coordinated military operations were launched earlier in late February 2026. The IRIS Dena was a Moudge‑class frigate of the Islamic Republic of Iran Navy, one…
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