Sorry to say, you are wrong Slim. You've got to control you own buoyancy as you descend. The floor is more than 400' below and you don't wanna go that deep. smile You want to level off at around 130', swim in and out of the stalactites for a bit, watch for sharks, and then after a short bottom time, begin your slow ascent with the group. There's a long safety stop before final ascent to surface.

A fish and a bird can fall in love, but where will they build their nest?