I've seen videos of octopi being quite clever with tools, like using coconuts as armor or hiding spots, maybe other like-creatures are also clever... Humans being humans, we've dumped a lot of plastic in the ocean, I wonder if octopi have used plastic bags as decoys for fooling their predators...

Speaking of plastic pollution, you're probably already aware of efforts like https://www.theoceancleanup.com/updates/unscheduled-learning-opportunities-on-the-north-sea/ , I hope their prototype tests are successful