The UKMTO confirms the announcement by the Iranian Navy that a tanker, east of the Strait of Hormuz, experienced an explosion on its port side, at the waterline. UKMTO did not mention that it was hit by a projectile, and since it was a waterline explosion on the port side, it could only be either:.
marine mine
USV attack.
Limpa Mines Since the Iranian Navy said sea mines, the probability goes to sea mines.