This Aulacoctena is a species of comb jelly that was imaged by remotely operated vehicle Global Explorer during the Hidden Ocean 2016: Chukchi Borderlands expedition. It is about the size of an orange.
Comb jellies are also known as ctenophores because they have eight rows of cilia in structures called “ctenes” which reflect light, giving off a rainbow shimmer under the bright lights of a remotely operated vehicle. These ctenes propel the jellies through the water so that the ctenophores can catch and consume their prey.
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Video courtesy of The Hidden Ocean 2016: Chukchi Borderlands, Oceaneering-DSSI.