You will need to take a scuba dive course if you plan on becoming a cavern divers. This course includes four scuba dives: the first is an outdoor practice dive, where you will learn the basic techniques of handling line and reel, avoiding silt-outs, and air management. Your instructor will also show you how to plan your dive and keep your orientation and air management under control. After the course you will be certified to dive in caves and other caves following safety rules.
Safety
The Rule of Threes is the cave diving safety protocol. The cave diver should have three types of light sources and at least two tanks. To ensure they are able to survive the dive, they should separate their gas into three sections. A more conservative gas management plan is preferable if the dive team is experienced and has a history of diving in caves. Cave divers need to be aware of cave hazards and practice safe diving techniques.
Equipment
Cave diving requires special equipment. You should have two safety reels. One should be used for guideline running, while the other should keep the line tension high while the diver is in a cave. Make sure each diver has a safety line with enough line to reach the cave entrance. Manufacturers will often pack the reels up to the edge with guideline when making a new reel. This makes them more susceptible to jamming. To reduce the chance of jamming, cut about 10 meters (30ft) of length before using.
Maximum penetration
TDI offers a cavern course to scuba divers looking to dive in areas where it is not possible to reach the vertical. This includes dives into caverns, and overhangs. Although it is not necessary to take a cavern diving course, this course will give you the skills and knowledge to make the most of this environment. This course will help you navigate dangerously through the small spaces that are sometimes hidden from your eyes.
Maximum depth
Cavern diving comes with its own limitations. Cavern diving requires that you never dive at night and that you are aware of your limits. Cavern diving requires advanced training, which is not the case for other types. If you're curious about diving in caverns, you'll need to learn the basic cave safety procedures and know your limits. You should also have some cave diving experience before you try it. You can then embark on a journey into cavern diving.