Sacramento has scuba and skin diving facilities available. Skin diving is the original method of diving which does not use any breathing equipment. In this, the diver has to hold his breath for the duration that he is underwater. Scuba is actually the shortened form of self contained underwater breathing apparatus, which is used for breathing during extended dives and underwater forays. One can do these either for the thrill, as a sport, or for observational and research purposes. A number of specialized, standard quality instruments are needed for this. Classes may also be held in Sacramento for mastering the art of scuba diving.