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adjust air consumption anchor line ascent avoid boat diving body bottom breathing resistance buckle buddy buddy's buoyancy control device cause charts decompression sickness decompression stops decompression tables deep diving depth gauge dive boat dive plan diver rescue diver stress diving activities diving equipment dry suit feet fins float hold hose increase inflate keep limited visibility ln addition lubber line magnetic mask metal minutes mouth-to-mouth artificial respiration move navigation neoprene night diving nitrogen narcosis no-decompression open water physical positive buoyancy possible problem procedures protection regulator repetitive dive repetitive group residual nitrogen safety scuba diving shore shown in figure side signals silicone situation skills snorkel sport divers strap submersible pressure gauge sure surface interval swim tank techniques temperature towing trip true course turbid water U.S. Navy underwater light victim watch wear weight belt wet suit