Ключевые слова: air, air valve, aqualung, beach, bottle, cylinder, deepsea diving, diving, diving equipment, double, equipment, extreme sports, flippers, fun, large group of objects, mask, metal, nitrox, nobody, oxygen, oxygen tank, physical pressure, preparation, pressure gauge, recreational pursuit, regulator, rubber, scuba diving, sea, sport, storage tank, technical diving, tourism, travel, travel destinations, underwater diving, water, water sport, waves,