Cave Diving is a highly specialized form of diving. You need alot of extra equipment and training. Properly trained cave divers are quite safe. Unfortunately, the springs in North Florida are very acessable and inviting. Alot of what are termed open water divers have died in them, they are almost always males between the ages of 16-25 years.
For the properly trained there is nothing like being suspended in the clearest water you can imagine in a 50' by 75' conduit. There are quite large caves down in Florida. Fossils can still be found in the deeper caves. Mastadon Tusks, whales, camels, sloths and other bones are found in the bottom and walls. Mostly the walls are composed of bone white limestone. Erosion makes the structures look like swiss cheese. Many of the holes are large enough to swim through- very beautiful and different. I miss them.
Rick