These are hydrothermal vent shrimp from the Mid-Cayman rise, and they are super cool. They like to aggregate near the top of the vent. I also really enjoy the commentary that goes on in this video. What's cool about these vents (those found in the Caribbean) is that talc, a silicate mineral, is found abundantly. Many other vents tend to be more sulfur-laden, so it's interesting to see the variety of mineral/chemical composition due to the location of the vents.