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
Bio: Gregg Eddy is a certified scuba instructor who has been teaching scuba classes for over 10 years.
Filmmaker: Clay Roberts

Duration : 0:1:40

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