South Korea’s joint investigation team has confirmed what many suspected: the fire aboard the HMM Namu on May 4 was caused by external strikes, not an accident. Two unidentified aerial objects hit the cargo vessel as it transited the Strait of Hormuz, damaging a 7-by-5-meter section of the hull and igniting a blaze that, mercifully, caused no casualties.

The HMM Namu, operated by South Korea’s largest container shipping line, was struck while passing through the narrow waterway separating Iran from the Arabian Peninsula. South Korean investigators concluded the damage was consistent with aerial projectile impacts, not mechanical failure or onboard malfunction.

Suspicions have centered on Iranian drones. Iran has…