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The most important scuba diving safety tip is to remain within the no-decompression limits and to ascend slowly on every dive.
Do not swim directly to the surface from depth. Rather, on each and every dive you make, pause your ascent for a minute or two at 20 feet, and again at 10 feet to make preventative decompression stops. Making a habit of this proceedure while scuba diving will keep you from painful decompression sickness.