- natural daylight is always present (a night dive in the cavern zone is a cave dive!)
- maximum penetration from open water is 200ft/60m
- maximum depth of 70ft/21m
- minimum starting visibility is 50ft/15m
- there are no restrictions (parts of the cavern where two divers cannot swim side by side)
- all dives are within no decompression limits.
An underwater cave is an overhead environment beyond one or more of the above limitations. Further training is required before you can safely entering the cave area.
Cave diving, is for a far more select group of individuals. Cave divers should possess near-instructor-quality buoyancy control and general diving skills. They should be utterly committed to diving in a highly disciplined and methodical manner and have an above-average understanding of the technical aspects of diving.
Cavern diving is the exploration of permanent, naturally occurring overhead environments while remaining within sight of their entrances. It differs from cave diving in that, while cave divers may penetrate thousands of yards, cavern divers generally go no further than 130 feet from the surface. Additionally, cavern divers keep the entrance clearly in sight at all times, and use a guideline so that, should sight of the entrance be accidentally lost, divers can immediately regain it.