Sand

You'd be surprised how variegated the sand is down here. When the ocean is particularly clear and the currents not too strong, then one can really appreciate the myriad of colour, texture, and granularity on offer. And you thought it was just loose granular material that results from the disintegration of rocks.

Other shrimp web-heads (or 'shred-heads' as I call them) might like to check out this fascinating article dealing with the Population structure of the deep-sea shrimp in the north-east Atlantic based on allozyme variation. Great stuff, and kudos to The Norwegian College of Fishery Science.