Rebreather Diving Why dive with rebreathers?
• New experience / challenge • Closer to marine life • Physiological benefits of Nitrox diving • Practical benefits of Nitrox or mixed gas diving (i.e. greater dive duration, longer no stop time, more efficient inert gas management) • Warmer breathing gas gives benefits in colder European waters • More efficient use of breathing gas Why must you have nitrox knowledge to dive rebreathers? The basic gas mixture breathed in any rebreather to depths of 40 m will be Nitrox and therefore the diver must understand the considerations of using Nitrox for recreational diving. Explain the basic differences between closed and semi closed circuits SCR units such as the Drager Dolphin and the San-o-Sub Azimuth use a pre-selected, constant flow, Nitrox mix that is chosen to match the MOD of the planned dive. Venting of excess gas occurs periodically during the dive and ascent. Closed Circuit Rebreather (CCR) units dynamically mix 100% oxygen with a diluent to form a breathable gas mix. For entry-leve
