مستند غواصی در زیر آب و تاریخچه تجهیزات غواصی

n antiquity, a hollow reed served as an underwater link to oxygen. As in days of old, humans still need self-contained breathing equipment for a variety of reasons--food-gathering, commercial, recreational, military, and scientific. Dive with the best as we test scuba diving's past, and look to a future of mechanical gills.The History of Scuba Diving and Equipment documentary

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