The Pit is a strangely deep place in a cave where you can dive for hours and not go deeper than 6 meters. We dove less than half-way, to 60 meters, as we only bought one tank of helium to mix our gas. At around 60, you hardly see the surface through the sulfide layers and the rocks are all tainted yellow. From 45 you see spectacular rays of blue light. (Thanks Luis for showing us where to go, and Steve for using the ropes to get all the gear up again.)