auvee, the reference I could find with Google for that issue is about clothing
working its way off due to wave action. Here is
another one. Somewhere in that rather large region I thought somebody had remarked about the limp bodies working their way out of the seat belts, too. If the seats broke from the floor there would be little to impede a loosely belted body from sliding downwards and out with the probably damaged spine providing the flexibility needed.
Of course, I could be conflating clothing being stripped off with seats being stripped off. Finding the correct Google search terms is difficult.