At 4:42 p.m. local time in the North Arabian Sea, a US supercarrier’s calm escort pattern snapped into crisis as sonar on an accompanying destroyer picked up the unthinkable: a burst of cavitation from an Iranian attack submarine and the launch of heavyweight torpedoes racing toward the carrier strike group.

Within seconds, klaxons screamed across the carrier’s decks. The 100,000‑ton ship heeled into a high‑speed turn as escorts dumped acoustic decoys and activated anti‑torpedo defences. One incoming weapon detonated prematurely in the carrier’s foaming wake, sending a column of water over the flight deck and knocking crew off their feet, but leaving the hull intact.

From that moment, the clock started on what US commanders now call “the eighteen‑minute hunt.” A P‑8 Poseidon patrol aircraft, already on station, dropped a lattice of sonar buoys while helicopters from two destroyers raced outward, dipping their own sensors into the sea. Cross‑referenced echoes traced a fleeing contact hugging the thermocline, sprinting for deeper water.

At 5:00 p.m., a US attack submarine shadowing the area fired. A heavyweight torpedo locked onto the Iranian boat’s fading signature; a muffled underwater blast followed, then rising oil and debris. The contact vanished from all screens. No survivors were reported.

Tehran hailed the attack as proof its navy could threaten a US supercarrier. Washington countered with a colder lesson: in modern blue‑water combat, a submarine that fires first may still die first — and in this case, it took just eighteen minutes.