Anúncio OnlineHotel In scuba diving, multiple air tanks can be used depending on whether it is a cold-water dive, recreational dive or decompression dive. Use a 50-percent nitrox mix in a scuba tank to increase the oxygen content with advice from a scuba instructor in this free video on scuba diving. Expert: Gregg Eddy Contact: […] ↓ Read the rest of this entry…