8 km below the sea level.
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It's cute, almost pink, and about twice as long as a cigar, with flesh so translucent you can see its liver from the outside.
Scientists on Tuesday formally documented the world's newest fish, Pseudoliparis swirei, an odd little snailfish caught at 7,966 metres in the Mariana Trench—nearly twice as far below the sea's surface as Wyoming's Grand Teton towers above it.
This creature of the dark, frigid ocean region known as the hadal zone was first caught in 2014 and again early in 2017 but is only now being described. And this species, the deepest fish ever collected from the sea, is probably not what most people think of when they imagine the creatures far below.
"The public normally thinks about anglerfish or viperfish," the black, monster-jawed fish with the dangling lanterns usually found a few thousand metres down, says Mackenzie Gerringer, a postdoctoral fellow at the University of Washington's Friday Harbor Laboratories. "By the time you get this deep, fish take a really different form. They have no scales, no big teeth, and they're not bioluminescent—that we know of." (See more photos of deep-sea creatures.)
That lack of certainty, of course, comes with the territory. This is just one of the two species of snailfish—there are more than 350 snailfish species known globally—caught on film during recent expeditions to the trench. Scientists on multiple expeditions have hauled up 37 individuals of Pseudoliparis swirei. They've also filmed one at 8,178 metres.