US Submarine Strike in Indian Ocean Brings Iran War to Asia

An Iranian warship is struck by a US torpedo in the Indian Ocean, from footage released by the US Department of Defense on March 4.Source: @DeptofWar/X

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By Philip Heijmans

March 6, 2026 at 4:30 AM UTC

Updated on

March 6, 2026 at 6:04 PM UTC

The US submarine strike on an Iranian warship in the Indian Ocean marked a sharp escalation in the war between the two nations, raising fresh security and economic risks across the Indo-Pacific.

By striking the warship IRIS Dena about 40 nautical miles off Sri Lanka’s coast, Washington signaled no Iranian vessel is beyond reach. The move has drawn India and Sri Lanka closer to the fray. With Tehran vowing retaliation, the risk of naval clashes is rising along sea lanes vital to global commerce.