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Scuba diving is a mode of underwater diving, where the diver uses specific equipment, which is completely independent of surface supply, to breathe underwater. There are different kinds of sport scuba diving like technical diving or cave diving. The safety of underwater diving depends on four factors: the environment, the equipment, behavior of the individual diver, and performance of the diving team. A proper education is needed to obtain a proper knowledge of hand signs and correct use of the equipment. The most common injuries in diving are barotraumas and decompression illness. There is even a specified field of medicine (diving medicine) which deals with health issues of diving. Overall, diving is a secure sport when acting and behaving responsibly—not only for oneself but also for the diving partner and the environment.