No type of rebreather can be said to be categorically safer than another. Statistics suggest closed-circuit rebreather diving is five to ten times higher risk than open circuit scuba. The quality of training may be the most significant factor affecting rebreather safety. No rebreather is foolproof, and the fact remains that compared to open circuit there is a disproportionate number of rebreather fatalities, many of which have been attributed to diver error. Your safety while diving is controlled by you, not by your rebreather.
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