Another picture of the ship, Cheonan
Ship hull is broken/split into two. The stern was the first to be gone beneath the waves.
If it was a mine what's the possibility of it striking the ship's stern?!
I would rule out an accident. It was either a conventional sea mine, a torpedo mine or a torpedo attack.
Somebody is playing a dangerous game . . .
I didn't imply it was definitely North Korea's doing though . . .but we can't help to think it's probably one of the prime suspects.