The answer is an additional gas supply available at 15 feet
Breathing gas supply becomes the limiting factor on most deep dives. that's why ssi recommends to have an additional gas supply available at 15 feet.
What is Breathing gas?
- A combination of gaseous chemical substances and elements is referred to as a breathing gas.
- The most prevalent and only natural breathing gas is air, but other gas mixtures or pure oxygen are also used in breathing apparatus and enclosed environments, including scuba gear, surface-supplied diving gear, recompression chambers, high-altitude mountaineering, high-flying aircraft, submarines, space suits, and anaesthetic machines.
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