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I think there are more variables here. For example, I'm pretty sure you can briefly surface after completing 25% of your O2 deco and then just resume the deco pretty much normally (on a short dive only, none of this hour or more 300ft stuff) Thoughts? At 03:52 PM 2/16/2000 -0800, you wrote: >To get a bit more specific, assume your buddy has a problem that >requires you to accompany him to the surface to hand off to medical >attention, but then you are asymptomatic and can return to depth >immediately (say, one minute or less surfaced). This actually happened >to me once. What I did, after notifying the surface of my intent, was >return to 5/4ths of the violation depth, and then resume the deco >profile from that point with no extension of stop durations, other than >the oxygen stop (6m) which I extended by 50%, still including breaks to >back gas. A safety diver came down to monitor me, and brought extra >oxygen, although I only used what I was already carrying. Got out >feeling fine, apart from a bit of fatigue, as if I had done the dive on >air (sub-clinical DCS?). Does this approach sound reasonable, or do >you have a well defined reason to extend the non O2 stops as you >suggested? > >If surfaced time approaches 5 minutes or so or if there are any >symptoms, I would go with the FFM and IWR protocol. > >-Sean > > >On Wed, 16 Feb 2000 13:15:46 -1000, Richard Pyle wrote: > > >Hi "Doc", ;-) > > > > > >>I > >> am curious as to what your thoughts are on resuming an interrupted or > >> ommitted > >> decompression, where the diver in question is entirely asymptomatic? > > > >Given that we understand so little about the relationship between > >decompression and bends symptoms, I'd say that any response to this > >situation (unanticipated truncation of planned deco profile) is necessarily > >"seat of the pants". My particular "seat of the pants" approach would be be > >get back underwater ASAP, return to depth at which ceiling was violated plus > >20 feet or so, then I would do something on the order of 120%-150% of the > >time at each stop depth that I had omitted. If return to the water is > >delayed for any length of time (5-ish minutes or more), I would lie > >horizontally and relax while others did whatever is necessary to allow me to > >return underwater. If possible, I would be guzzling fresh water during this > >period and, if available, would be breathing O2. Of course, if O2 was > >available, I'd probably opt to get back U/W with it. Even if I felt the > >need to return to a depth greater than about 20-25 feet, I would be > >breathing the O2 at 20-25 feet while waiting for the support folks got me a > >mix that I would breathe deeper. All of this, of course, is contingent upon > >specifics... > > > >Aloha, > >Rich > > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. ---------------------------------- Kevin Connell <kevin@nw*.co*> NW Labor Systems, Inc http://www.nwls.com How much extra bandwidth would we have if we didn't have these stupid signatures, anyway? ---------------------------------- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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