That looks like Enypniastes to me.
Enypniastes eximia.
You can see him feeding. Oh my god, how adorable.
These tentacles, which are modified tube feet, scoop in the sediment,
and they are only taking in material from the surface of the sediment, which is higher in organic material.
They're benthic, but the do spend a large portion of their life up in the water column,
whether that is to get somewhere much faster --oop, getting rid of his poop just before he lifted off.
And that's something that these holothurians are known to do,
they drop as much weight as they can just before they lift off.
But here you can see that it's either trying to get somewhere more quickly or, more likely, trying to evade a predator,
and that's probably what it makes of D2.
The name Enypniastes means dreamer.
So dreamer is certainly an apt name for the way that sea cucumbers swim.
Bob Carney tells us that in addition to the name dreamer, common names include the Spanish dancer and,
apparently a favorite among Gulf of Mexico industry ROV pilots, the headless chicken monster.
I just think it makes no sense. What part of that looks like a headless chicken?