The deep sea is the lowest layer of the ocean, at a depth of 1800m or more. Little or no light penetrates so deep; it was therefore thought historically that no life would be found there. But on the contrary, sea life thrives in the deep sea and their world looks more like an alien planet.
WATCH HERE: 8 Incredible Deep Sea Oddities!
Gallery: Few of them from the list
Image: Barreleye Fish Credit: http://weirdopedia.org/
Image: Taonius Credit: mbari.org
Image: Bloodybelly Comb Jelly Credit: montereybayaquarium.org