During your first open water dive you'll practice line handling, reel use and emergency procedures without entering a cavern. But, for your next three dives, you're headed into the cavern, staying within the light zone and 40 meters/130 feet total distance of the surface.

You'll also cover the following:

• Planning, organization, techniques, problems and hazards of cavern diving. 
• Special equipment use, such as lights, guidelines, reels and redundant breathing systems. 
• Proper body position, buoyancy control, air management and emergency procedures. 
• Cavern diving hazards such as silting, line problems, disorientation and emergencies.