Manuel SilvaA guitarfish off the western coast of Africa.
Claudio GazzaroliUnder the ice in Switzerland's Lake Sassolo.
Imran AhmadMirror image: A parrotfish.
Alexander SemenovThe polychaete worm, Nereis pelagica, swims in Russia’s White Sea.
Alexander SemenovThe Cyanea capillata, or lion’s mane jellyfish, is the world’s largest. Its dome can grow to eight feet in diameter, and its tentacles can reach up to 118 feet. What’s more, those dangerous tentacles are almost invisible when stretched to maximum length.
Daniel BotelhoThe strange-looking mola mola, or ocean sunfish.
Christian VizlMexico's cenotes can seem otherworldly.
Ludovic Galko-RundgrenA pygmy seahorse.
Jeff Rotman/Minden PicturesChances are you'll never encounter a bigeye houndshark. This strange guy was photographed at 1600 feet in the Red Sea. Nope, that's not a typo.
It’s a common feeling among divers: As soon as that mask hits the water, you’re immersed in an alien world, as oddities of every shape and size cross your field of vision. But this group of ocean oddities is weirder than most — that is, of course, after humans, which are indeed the most alien of them all.
