I have never seen a ship sink... Okay, mandatory pause here for a corny submarine joke. What is the difference between a submarine and a regular ship? Hint, it is not that a submarine can dive. Give up? Answer: it is that a submarine can surface.
Cynical old submariners will add, "usually." Any ship can dive once, it's called "sinking." The trick is coming back to the surface, and you can only do that if you a) are a submarine and b) have your shit together.
Anyway, that Italian cruise ship that hit the rocks and essentially sank was gashed and took on water on the port side, and yet pictures show her lying on her starboard side. The gash in her hull can be seen, well above the present waterline. WTF?