Well, if you're on the shallow waters, they indeed will just half-sink and their stern/front will stay on the surface.
I once had to patrol a grid on english channel.
On my way there I sunk large tanker, it blew in half and both parts' "heads" stood on the surface.
Couple of days ago I was returning to home, and passed the same spot where I sunk that tanker, the "heads" still were there, sticking out of the surface.
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