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A bit more info folks......... I investigated this area some time ago in an attempt to gain some info on neon as an alternate diluent gas for deep mix work. The bottom line appears to be that little research has been done. Any that has been done has been kept fairly close to the chest of the people doing the work. A couple of things that came from my investigations:- (1) Not sure about this theory about Hydrogen combusting when exposed to 4% O2. Sure it has a large explosive range, but for combustion to take place we need three items - fuel,oxygen and a source of ignition. We have fuel (hydrogen), we have oxygen but we do not have a source of ignition?. (2) Neon seems a viable alternative (except the cost), concern seems to be the treatment of a DCI hit in a diver that has been using neon. Outside my knowledge here, but surely a bubble is a bubble regardless of the gas it contains.Raising the ambient pressure high enough should, in theory 'crush' the bubble back into solution.The problem then would be one of a suitable decompression protocol. Comments on solubility etc were thrown into the arena. Anybody any hard facts? (3) Having spoken to Jeanne-Pierre Imbert who worked for Comex during the Hydrogen trials the following may be of interest. The research proved the benefits of hydrogen and was succesful in reducing HPNS effects.The downside was not the explosion risk (since the mix contained less than 4% O2 at the 500m+ depth of the tests) but was the curious side effects in some members of the dive team. Whilst the narcotic effects were negligable, there were psychotic side effects noted. This may have been a combination of things, but it was thought more likley that this was due to breating hydrogen at around 50 ATM.Symptoms ranged from feeling ill at ease, to a great desire to be brought back to normal atmospheric pressure Comex no longer envisage the use of hydrogen. Regards Chris --------------------------------------------------------------------------- Chris Hellas EMail:- chris@de*.de*.co*.uk* 10422,2334@co*.co* Voice:- (U.K) 01274 878944 ---------------------------------------------------------------------------
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