If you stare at the point to the left of the ship and just under it, it seems the detonation occurs, then hits the ship after a delay of perhaps 1/20-1/10 second. The explosive seems to have been just under the ship, not in contact with it. Also, the radar arrays don't seem to be moving, showing that the ship is probably unmanned and not running. The lack of a wake leads me to believe it isn't moving. (Note that the water is undisturbed in the entire video frame before the detonation.) The fact that the massive explosion did not displace the ship sideways would indicate that it is firmly anchored in place. This supports the theory that this is a deliberate sinking. Anybody have a copy of Jane's All The Worlds Navies, and can maybe identify the ship or type?