Giving a talk, and I need some help

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Since I personally have yet to get into cave diving (one day) I would really like to know how it differs from open water. Is there a need for different training( or better how does it differ), different equipment, etc. How about the environment as it affects the body - is there a difference? What about aquatic life...I have no idea what I would expect to see.

I have been cavern diving, but some folks may not have tried that either, so I would start with some great photos and maps, and then discuss the difference between open water, any overhead environment, cavern diving and cave diving. Maybe you can draw them in by starting with something that seems closer to their existing experiences, and then describe the beauty & fun, safety & equipment, and honest risks of cave diving. And for real enthusiasm, when you talk about equipment, pass around some cookies and arrows or other specialized equipment as well as some chocolate chip cookies. Fun and memorable!
 
Caves are very different. Some are dark, even black; some are startling white, and some are tan or gold. Caves in Florida are often a deep gold decorated with black goethite. Some caves have tiny, delicate decorations and some have massive pillars and walls of flowstone. Some open into huge rooms and halls, like the NoHoch main line. Others form tall hallways, like Jailhouse or the Southwest Sacbe passage in Naharon. Some form intimate pipelines like the one in the video. Some have pots in them, and some have bones, and some have the evidence of old firepits.

Some are highly decorated, and others are more impressive for huge chunks of limestone. Some have multiple openings to the surface, which can create amazing light effects. We did one dive this last trip where I think we went through four cenotes, each with its inhabitants, including two big tarpon. Ponderosa's open water has lovely dark eels, as well as cichlids which are fun to watch in their territorial displays. In Carwash, the tetras will nibble on your fingers as you debrief the dive.

In the caves, there are pure white blind cave fish. They aren't common, but I have seen a few. There are also shrimp and amphipods, also white or colorless. But most people don't dive the caves for the life forms.

We dive them for the beauty; for the water, which is as clear as air; for the sensation of flying. We dive them for the planning and the teamwork and the joy of using technique skills we've worked hard to gain. We dive them for the mystery and the fun of answering the question, "Where does that go?" We dive them for the pleasure of being somewhere very few people have ever seen -- sometimes, if we're lucky, being somewhere NO ONE else has ever seen.

The caves are amazing and addictive, and each system has its character.
 

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