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A.Appleyard wrote:- > ... 3 or more aqualung-type systems at once (heliox (for deep), air or nitrox (for shallower), oxygen (for decompressing)) and chose the wrong mouthpiece at depth:... if he had used a large AMRB (= automatic mixture rebreather) instead (helium as diluent), could this tragedy have been avoided? > As the AMRB is closed circuit, much less diluent is used than with an aqualung, and there would be no need to carry nitrogen also merely to avoid using up expensive helium in shallower water. ddoolett@me*.ad*.ed*.au* replied on Wed 20 Jul 1994 09:59:07:- > ... switching to nitrogen at shallow depths is not to conserve helium but [to] provide a decompression advantage ... tissues approach saturation slower with nitrogen than with helium ... How easily could alternating between nitrox and heliox be managed with a large AMRB which had 2 diluent cylinders (for ordinary diving both turned on and both containing air, but) one can contain air and the other can contain helium or heliox and the diver can switch between them? Presuming that he can easily empty his bag & his lungs to flush when changing diluents. For trimix: is there such a thing as a ppN2 meter that could be put in an AMRB? Since when have ppO2 meters been available that would have been suitable for use in AMRB's?
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