Why is there a 40 m maximum depth limit for Nitrox mixes in rebreather diving?
The Entry Level Rebreather training for both SCR and CCR rebreathers provided by the recognised Training Agencies qualify rebreather users to dive Nitrox mixes to 40m, with minimal decompression diving. BSAC has also independently considered in detail the physiological implications of re-breather diving using Nitrox mixtures. The 40m limit is based on the risk of carbon dioxide retention (hypercapnia) and the pre-disposition because of this to CNS oxygen toxicity.
