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Dave Story writes: > JR Oldroyd > > > In some cases, it > > may be necessary to reimmerse on oxygen to 50m; in other cases, 9m > ^^^^^^^^^^^^^^^^^^^^^^^^ > Surely this is a typo... > > And then proceeded to make what I must assume is a typo about a 50m > pure O2 recompression. This simple mistake points out (to me, at > least) the ease with which mistakes can be made, and the potential > fatality of those mistakes in the case of inwater O2 recompression. I think this is a little harsh. Making a typo, even when the meaning is changed to something clearly unreasonable and dangerous is hardly the same thing as making a mistake like that in practice. If I didn't make and carry out dive plans better than I type notes for the network I'd either have quit diving, drowned, or least been bent long ago. > I certainly don't expect the vast majority of "technical" divers who > dive without major logistical surface support to be able to make such > a decision "within 5 minutes of the onset of symptoms?" I agree. Even hospitals with chambers aren't that hasty about recompressing in most cases. > > > I submit, and I counter Bill > > Mayne's point in an earlier article, here, that NONE of us here really > > do dive sufficiently close to a recompression chamber to be able to rely > > on making it to the chamber for treatment. And I submit: (1) Few of us have the equipment and technical support to even consider in-water recompression. Like most non-professional divers I don't have a full face mask and would rule out in-water recompression as directed in the Australian tables on this point alone. It is just too dangerous to breathe oxygen at 30 feet or deeper without a full face mask. (2) Many of us can expect to get to a chamber within an hour or so, which may be our best course of action. I'll bet you have helicopter ambulances even in the Boston area. At least you wouldn't be driving yourself to Groton at 55 m.p.h. I ask, considering the rigors of New England diving, would you have the oxygen, full face mask, thermal protection, and support, in and above the water, to carry out the prescribed in-water recompression? Bill Mayne
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