family and friends SHOULD NOT WATCH this video of a F-4 as it hits a brick wall at 400mph. I'm posting it for illustrative purposes only.
Remember where this supposedly took place. This part of the ocean is home to what sailors call the "roarin' forties", i.e, where 40 knot winds and 40' seas are common. Even with a perfect ditching in those conditions the airplane would have quickly broken up. If the airplane broke up on impact or as a result of the sea conditions there would be floating debris everywhere. Depending on how the airplane was configured the debris would include a couple hundred floatation devices, aka, seat cushions. They don't sink.