Snuba
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Snuba is a portmanteau word formed from "snorkel" and "scuba". In it, the swimmer uses the fins, mask, and breathing apparatus commonly used in scuba diving, but the air tanks which are usually strapped to the back are instead attached to floating rafts that remain on the water's surface. Snuba diving is a popular activity in tropical tourist locations such as Hawaii because of its relative ease and because one need not be certified to participate.
If the depth of a snuba dive is limited to 20 feet (6 metres), decompression sickness is not likely to be a problem. However, as the snuba diver is breathing compressed air, there is still a risk of injury or death due to barotrauma even at shallow depths if the diver descends or ascends without equalising the gas pressure in air spaces such as the ears and lungs with the surrounding water pressure.
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