Well certainly the front shouldn't have fell off I can tell you that much.
Water is quite heavy and dense. When you are jacking around with differential buoyancy, you're dealing with forces that can break the back of a ship. This is how torpedoes often wreak the worst damage. The overpressure can lift a part of the ship and break its back. Flooding the 1st 3rd or a ship could do something similar.
Hopefully they'll have removed the ship from the environment.