Well that's horrifying.

Have you ever heard of foreign driftwood? It’s what you call the bits that turn up that aren’t a good match to any nearby tree species. Beyond that there’s also what’s called alien driftwood and those are the bits that are unable to be matched to existing tree species on the planet.

Alien driftwood didn’t show up on a meteor obviously, and it wasn’t planted by ETs, but it probably comes from an ancient sunken forest somewhere in the depths of the oceans. The thing about a lot of alien driftwood is that it still shows signs of active nutrient circulation when it surfaces meaning that it has only died recently!

Somewhere on the bottom of the sea there probably is a living forest. Questions have arisen about the sunken city of Atlantis or other lost civilizations. The problem is, the driftwood bits often contain nested animals - underwater birds and sea-tree frogs. These animals are vicious and super strong and as soon as they’re disturbed they come raging out of their nests and fend off researchers. Soon after that, without fail, a team of elite scuba beavers emerges from the ocean and cuts up the wood and drags it back to sea. We’ve never been able to learn much about these wood pieces because of the elite scuba beavers’ ability to dismantle it so fast.

Source: https://www.reddit.com/r/mildlyinteresting/comments/j3d6g2/comment/g7bzrdr/?utm_source=share&utm_medium=web2x&context=3

There's also something called a deadhead log - one that has gotten waterlogged so that it floats vertically. You can't see them in the water, but when they move with the swells if you're traveling over one in a boat, it can punch a hole right through the hull.

One if them took out one of our ferries last year I think.

Does it matter where you are though and if you're far from the beach? Like if you were far out to see I bet you could grab one as a life raft.