Black water diving is where you dive out in the 'blue' well black in this case since it's at night time, in the middle of nowhere, with nothing but sea all around and down for miles! Quite simply a thrilling experience but not for the faint hearted!
You set a line with a light on the end to draw up the aliens down to about 30m+ above deep water, like really deep, like 2000+ deep! Its truly an exhilarating experience and makes for some really interesting photo opportunities you would never get the chance to capture in a reef environment.
Its not everyday you get to see a shrimp riding a jellyfish though the ocean!!!
The few shots below were taken above 2500+ meters of water