In my comic, Eternalfold, the sea goes on forever and the further out you go the larger the creatures and waves get. This little galleon sailed too far from shore and has attracted the attention of a rather hungry eel.
I pictured the eel as a kind of mobile island with all sorts of algae and coral growing on its scales. It's difficult to see in the digital version but all those little dots around the eel are various sea life that live off of their host and the other things that the eel hunts. This particular type of eel can grow quite large - over a mile in length but is usually found between 2000 and 4500 feet long. They are also known to be very aggressive and will attack creatures larger than itself but fortunately they ignore anything that's smaller than a mid-sized sailboat.