Natural dive sites include submarine canyons with sheer drop-offs, lakes, rivers, and coral and rock reefs. Natural sites have the benefit of marine growth that might be thousands of years old. Specially trained divers also enjoy the thrill of exploring underwater caves Chapter 8- Diving Environment and caverns or diving beneath the ice of frozen lakes. While there are many types of fascinating places to explore under water, many of them require special training beyond the NAUI Scuba Diver certification course. Any diving environment that does not allow direct vertical access to the surface is called an overhead environment. Overhead environments include caves, the interiors of wrecks, and waters beneath the ice or heavy kelp (figures 8-3, 8-4, and 8-5). These environments are highly specialized. They require additional special equipment and training no matter how much experience a diver might have diving under other conditions. Even instructors need special training for these types of environments. ENTRIES AND EXITS The easiest diving is usually from boats, and in many situations, boat diving offers some of the best diving available. Beach diving is a popular alternative for many divers and can be extremely enjoyable. Beach diving is generally more strenuous than boat diving, but both present varied and unique diving situations (figure 8-6). Diving Environment 177 FIGURE 8-2. SHIPWRECKS ARE ALSO POPULAR DIVE SITES. FIGURE 8-3. CAVE DIVING REQUIRES SPECIAL TRAINING AND EQUIPMENT. FIGURE 8-4. DIVING INSIDE WRECKS ALSO REQUIRES SPECIAL TRAINING AND EQUIPMENT.
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