All of planet Earth has been mapped, explored, and photographed, except for one place: the ocean deeps. Is a place so inhospitable, so dark, cold, and pressurized, that only in the last few years have we managed to send a human down to the absolute depths. Even then, that's only to one small point in a watery jungle which covers two-thirds of the Earth's surface.
What we're trying to say through all this rambling is that for the most part, we have no idea what's down there. When something does appear - like this fish, for example - it's unlike anything we've ever known. A beachcomber found it on the cape of South Africa, but sadly threw it away before further studies could be done. For now, the deep will remain a mystery.