The footage was taken by a robot in the Mariana trench by researchers from the University of Hawaii. That is 8.143m deep. The species is unknown. Exciting!
“Video of a newly discovered species is now the world’s deepest known fish recorded at 8,143 m depth. The fish has a novel body form that has not been seen before. It stunned scientists because in other trenches, there is only one fish species at this depth–a snailfish; this fish is really different from any other deep-sea fish that scientists have ever seen.”