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Charlie, your way definitely gets the job done. To answer your other question, on a long dive, we do it foot by foot from 30, and on those dives we are the lowest oxygen still breathable gas in order to reduce the risk of tox ( usually the 190 bottle), as we have been in a trough on oxygen for a while at 30 feet which is too much risk of tox to get back in the water on oxygen. In fact, we go off to back gas for 10 minutes before we get in the water on the 190 bottle. In open diving, this would not be the case, and you would be using the oxygen, having been taking breaks and only breathing the oxygen from 20 feet. Charlie Roberson wrote: > > At 07:43 AM 12/24/99 -0500, kirvine@sa*.ne* wrote: > > >5) slow final ascent - the last move up to the surface is one of the > >most critical. No matter how long you sit on a stop with the window wide > >open, there will still be gas that will not be displaced by this method. > >When you increase the gradient by trying to surface, the last of the gas > >comes out rapidly and does so in bubble form. You must do a slow ascent > >to reduce the risk of this, and for long dive it is one foot per minute > >to the surface, for this dive it is more like 2.5 - 3 fpm. > > I have seen evidence of this in a dive buddy. We made a slow but direct > accent from 20' after a thorough deco and he suffered the consequences. I > have since adopted the practice of adding 3min safety stops at 15', 10' & > 5' with very good results. Of course, we always do surface deco > appropriate for the dive. > > Are you going to back gas for your final accent? > > Charlie -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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