The difference between open water diving and cave diving is that Caverns and caves are what experts call overhead environments environments in which divers do not have direct access to the surface. As for open water diving a diver who is without air and separated from his or her buddies can still make an Emergency Swimming Ascent (ESA). Being in an overhead environment takes away this important safety factor. Cave divers must exercise to protect irreplaceable cave formations from harm. While open water diving is more safe and less stress to worry about. Cave diving and open water diving are so different in many ways. They are both absolutely amazing though. The bottom line is that, despite the fact cave, and open water diving all take place in overhead environments, they are separate and distinct activities. Each involves a different set of risks, and each requires its own unique equipment, techniques and procedures.
http://www.cavediving.com/what/start/02.htm
http://www.ginniespringsoutdoors.com/faqs.php
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