Among the weirdest things we've found in the deep sea: A carpet roll, a yoga mat, a whole toilet, a half toilet, a plastic bag of plastic bags...
...also, there was that whole thing with the hydrogen bomb and, more recently, the other time we found an atom bomb on the sea floor: https://www.news.com.au/technology/science/canadian-men-goes-diving-for-sea-cucumbers-stumbles-across-missing-us-nuclear-weapon/news-story/692f66ada83699bc1562bfbcf8764b66
What I'm trying to say is "pick up your shit."