New images from exploration voyages show how weird and wild it is under the sea.
Pictures taken of never-before-seen areas, especially off the eastern Pacific, show what looks like an imaginary world.
There's a delicate jellyfish, an eel with a strange head and a purple disco ball-like critter. And just in time for Halloween, there's a rare purple vampire squid, nicknamed for its red eyes and deep colour.
The images are being shown as part of the National Ocean Exploration Forum this week in New York.