Curiouser and Curiouser: Tanker "Was in a Collision"

AP is now reporting that the Director General of the Port of Fujairah is now saying the Japanese tanker M.Star was in some sort of collision (See previous story.) So thus far it has been attributed 1) to an explosion, 2) a big wave caused by a seismic event, and 3) now a collision with something unnamed. A Reuters report examines several possibilities including collision with a submarine.

Hmm. A supertanker loaded with crude can get dented badly in the Strait of Hormuz, and nearly a day later no one is sure what happened?