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On 8 Dec 1994, Roger Carlson wrote: > I'll move into the pro-IWR corner with Rich. One question, though, for Rich in > particular: given that you have all the necessary tools (thermal protection, > gas supplies, maybe a full face mask, good environment, safety divers, surface > support, hang lines to control depth, whatever you feel is necessary to balance > the risk and benefits) > > would you use a deep air spike? Do you feel that you basically have to, when > you don't have O2 along? what about a deep air spike before the O2 sequence? That's an EXCELLENT question. As with most aspects of the IWR issue, I'd have to say "it depends..". In fact, it depends on MANY things, (time of day, availability of gas, surface conditons, current velocity, dive profile, local shark behavior, etc etc.) Historically, yes, every case of IWR I've personally been involved with incorporated a "spike", and all turned out successfully. > as I understand it, the deep spike is falling into disfavor, but that might > only be when there is O2 available. If I recall correctly from AquaCorp, most > chambers only go deep for AGE, I believe to 160 feet (table 6a?) and for > simpler DCI go only to 60 feet (table 6?), maybe on EAN50? The trend does seem to be drifting that way, yes, but that don't mean it's right or correct or better. Part of that involves the risk of bending the tender, etc. From what I hear of experience in Australia (Carl Edmonds & others), the spike seems like it might not be necessary. I suppose in the future I'd be tempted to drop to 25fsw on O2 and hang for a few minutes. If symptoms vanished, I'd stay. If not, I'd consider a spike on some other gas. Not that I'll ever get bent in the future.... ;-> Aloha, Rich deepreef@bi*.bi*.ha*.or*
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