It's well known that the oceans are cluttered with flotsam, jetsam, and flotillas of drifting debris. The "Great Pacific Garbage Patch" is a giant whorl of floating plastic refuse that has been estimated to rival the size of Texas. I've read that this place would be impossible to clean up due to its vast expanse. It is also impossible to guess how many animals swim through or fly into this toxic dump. Interestingly, the majority of the garbage comes from land, and not sea-going vessels.
It is also well known that the animals that pass through this area directly ingest a lot of plastic. They also ingest planktonic animals that have stored plastic toxins. Eventually, the toxins accumulate as they move up in the food chain.
I've been to sea. I know what it's like to bake on a windless, seemingly bottomless expanse. We passed the occasional jumble of line and bouys, but we never saw the dump. But, it was there... in molecular form. What a bummer.