Top Three Theories on What Damaged Japanese Oil Tanker Near Iran

Whatever it was that shook a 260,000-ton Japanese supertanker as it sailed through calm waters between Oman and Iran just after midnight Wednesday, it was not a freak wave.

But beyond that, officials investigating a huge dent in the side of the M. Star are still some way off establishing exactly what happened.

Several theories are doing the rounds: The 333-meter-long ship collided with a submarine or a degraded sea mine left over from the Iran-Iraq war; there was an internal explosion; or, most unsettling of all, it was the target of an attack by pirates or terrorists in a strategically vital stretch of water in a sensitive region.'

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