Are fossils well preserved on the deep ocean floor or in extraordinary deep locations like trenches? What about under the sea floor? I suppose there must be bo

Are fossils well preserved on the deep ocean floor or in extraordinary deep locations like trenches? What about under the sea floor? I suppose there must be bone-eating organisms on the floor, given the number of dead bony animals that must lie there. But there is also a lot of pressure and I don't know how seawater affects fossilization. I'm really wondering: if we could get easier access to the deep ocean floor, would it impact archaeology in a big way? > when they lived from 215 million to 66 million years ago. I hadn't thought about it, but what happened to organisms living underwater during the K-T extinction event (which was 66 million years ago).