A shot from inside the open top "Ben's Cave" in Lucyan National Park in Freeport, Bahamas. Most of what is floating on the waters surface is calcium picked up by surface water leaching through the caves limestone roof. 
I generally have not had much luck photographing in caves - not that I've had that many opportunities! It seems to me like a very specialized type of photography akin to shooting underwater. Most of the photos I took at Carlsbad Caverns in New Mexico in June suffered from exposure issues or were just generally flat or uninteresting. On this particular shot however I did like the way the colors came out and the separation between the subject and the back of the cave.
