The ocean is a mysterious place. Our fascination with it has only grown with time – the things we learn about it only make it even more interesting. It is home to some of the weirdest animals on the planet, and a paltry 5% of it has actually been explored. Even in that small fragment of the full picture, there’s enough detail to puzzle and thrill us. These twenty discoveries touch every part of human knowledge, informing science, history and mythology. A few of them are even strange enough to generate their own mythology when their origins are unaccounted for.