Disadvantages of Rebreather Diving
The main disadvantage of a rebreather, relative to open circuit breathing apparatus, is that, due to a failure, the gas may continue to flow, but the mixture provided may not support life, and this may not be obvious to the operator. With open circuit, this type of failure is unlikely, and the most common type of failure there, the lack of air flow, is obvious, and corrective steps (like changing to an alternative supply) would be taken immediately.
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