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Dear Brian Again I have to apologise for not making my posting more clear. Due to the constraints on our diving schedule we could not extend our surface intervals to enhance diving safety, instead we did our usual S.I. but did it with 100% o2 for the first 45 minutes. On the whole our total time out of water was not changed. The quality of the rest we experience between dive was also little changed as we were breathing from a surface supplied o2 rig on a 40' hose that allowed use to complete all of our usual duties. I must admit that at that time I had no way of calculating the net benefit of the addition of o2 to our surface intervals. I now am using Decom to cut tables with O2 surface breathing but I still am facing the gear constraint of packing all of the compressed o2. As Mr Appleyard has pointed out small home built rebreathers were once quite common, these would be ideal for o2 surface intervals. With the addition of a full face mask an o2 rebreather would also seem to be the ticket for in water recompression from small boats. Thanks Bill >but how do you know that the benefit was an effect of the oxygen, rather that >having a extra 45 minutes of rest after each dive, as opposed to the other usual >duties you describe? There is no doubt that oxygen is of benefit for DCI as you >describe for your shoulder, but I raise this only as a scientist. > >_______________________________________________________________________________ >Subject: Re: byo rebreather >From: seasport_scuba@su*.ne* (Bill Brooks) at internet >Date: 12/16/95 16:05 > >I recently began using surface o2 to improve my diving efficiency at work. >While doing u/w log recovery in the 40' to 85' range, we were pulling 5 very >hard dives per day averaging approx. an hour per dive. We would do about 5 >minutes of deco at the end of each dive. We were working 5 days per week >and had a working day of approx. 14hours/day with non diving time being >spent tending and humping gear. At the end of each day we were a sad sorry >bunch divers with a great deal of general fatigue, but no clinical dci. As >our work progressed we were forced to dive progressivly deeper to recover >wood in quantity. In order to minimize the chance of an expensive dci >episode we began using 100%o2 for 45 minutes via demand reg after each dive. >The subjective difference was amazing! We were working deeper and harder >and yet were able to do far more work and finished our days feeling like we >had put in a hard day but without the degree of post dive fatigue and mental >cloudiness we had previously experienced. On approximately the 12th day of >this I had a hit in my right shoulder that was resolved within about 20 >minutes after going on to o2. Needless to say all of this made a believer >out of me. >Thanks Bill
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