evidence: In the Clarion-Clipperton Zone of the Pacific Ocean between Mexico and Hawaii, marine scientists have discovered animals humanity has never seen before: creatures who live very different lives, in the permanent darkness of the abyssopelagic. [...] In the image above, captured using the ROV, the animal's digestive tract is clearly visible, full from its feeding forays on the seafloor. It also has a long, unusual tail probably used for swimming. [...] Other creatures include a delicate glass sponge, a cup-shaped filter feeder with the longest known animal lifespan on Earth, up to 15,000 years; a tanaid crustacean with a long body, almost like a worm; sea stars, corals, and anemones; and a spectacular Barbie-pink sea pig.