Explosive new leaks have revealed that Australian submariners were on board the US attack submarine that torpedoed and sank an Iranian warship south of Sri Lanka, thrusting Canberra into the centre of the spiralling US–Iran conflict. Defence sources say a small Royal Australian Navy detachment was embedded as part of a hush‑hush AUKUS “skill‑sharing” program when the order to fire was given.

Officials in Washington insist the Australians had “no command authority” over the engagement, describing them as observers and trainees as the Virginia‑class sub tracked the Iranian frigate and launched the fatal Mark‑48 torpedo. But in Tehran, the narrative is very different: state media is branding Australia a “full combatant” and warning that “all bases and vessels aiding US aggression” are now potential targets.

In Canberra, the revelations have detonated a political storm. Opposition leaders are demanding an emergency parliamentary inquiry: who authorised placing Australian sailors on a shoot‑to‑kill mission, and why was the public kept in the dark as the Indian Ocean turned into a war zone? The government counters that the deployment was legal, tightly controlled and essential for training crews ahead of Australia’s own nuclear‑powered submarines.

Across the region, allies are rattled. Sri Lanka and India, already alarmed that a US–Iran showdown has arrived on their doorstep, now face the prospect that AUKUS partners are quietly fighting a shadow war in their backyard. And as images of the sunken Iranian hull loop on Iranian TV next to the Australian flag, one question hangs over both Canberra and Washington: has a “training mission” just dragged Australia irreversibly into America’s next big war?