Timeline
IRIS Dena
Iranian frigate torpedoed by a US submarine in the Indian Ocean, March 2026.
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#276 Mar
Mentioned in: China in Hormuz safe-passage talks
Iran Conflict 2026#256 Mar
Mentioned in: CENTCOM: 43 ships sunk, 3,000 targets
Iran Conflict 2026#246 Mar
Prompted India to break four days of diplomatic silence
Iran Conflict 2026: India breaks four-day silence on Iran#236 Mar
Thirty Iranian ships sunk in seven days
Iran Conflict 2026#236 Mar
Mentioned in: US destroys second Iranian drone carrier
Iran Conflict 2026#236 Mar
Triggered internment of sister ship IRIS Bushehr by Sri Lanka
Iran Conflict 2026: Sri Lanka interns IRIS Bushehr, 208 crew#215 Mar
Mentioned in: Satellite images reveal Fifth Fleet hit
Iran Conflict 2026#215 Mar
Acknowledged as lost by Iranian FM Araghchi for the first time
Iran Conflict 2026: Araghchi confirms IRIS Dena loss#225 Mar
Mentioned in: IRIS Bushehr approaches Sri Lanka
Iran Conflict 2026#215 Mar
Created political pressure on India via domestic shipping safety concerns
Iran Conflict 2026: IRIS Dena sinking pressures Modi#215 Mar
Mentioned in: Two warships sunk at Chah Bahar
Iran Conflict 2026#184 Mar
Iran warship IRIS Dena sunk, Sri Lanka
Iran Conflict 2026#194 Mar
Confirmed sunk by a US submarine torpedo at a Pentagon briefing
Iran Conflict 2026: US torpedo sinks Iran warship IRIS Dena#194 Mar
Mentioned in: IRGC: US destroyer hit in Indian Ocean
Iran Conflict 2026#194 Mar
Killed at least 80 crew per Sri Lanka's deputy foreign minister
Iran Conflict 2026: 80 dead on IRIS Dena; 100 missing at sea#194 Mar