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Scott, on that dive I did 8.5 hours of deco from the fist stop at 240 feet. Bottom time was 6 hours at 285-300 and we had 10 minutes of run time to get to the bottom. Total time in water for me was 14 hours and 10 minutes. I was back home in Lauderdale the next morning. I ran a bottom PPO2 of < 1.0, and a deco PPO2 of 1.6 max . I did back gas breaks every 20 minutes from the botttom for 6 minutes, and two 20 minute back gas breaks - one prior to the 120 stop and one at 50 feet. I cut the 40 foot stop to 20 minutes and then did 150 minutes on oxygen/18X35 trimix at 30 in the trough by going 12 on 6 off, and did a stratght ascent to the surface from 30 ( we do not do that anymore). No ill effects what so ever, and I was able to work out at my full rate the next day. Scott Hunsucker wrote: > > Martin, et.al., > I am glad to see a discussion beginning on here about this very real > problem. This is my main area of research interest in the WKPP, and one > that many people don't seem to take seriously. > Martin has included some very useful information that has been in use > for many years. He is correct in stating that the values expressed are > conservative. Hopefully, the science of diving will catch up with the > "real world" of diving and we can all benefit. > I recently presented at the Undersea Hyperbaric Medical Society-Gulf > Coast Chapter's Annual Scientific Meeting in Atlanta. I used data from the > world record dive performed in 98. After 18,000 feet in Wakulla, a BT of > five hr at 300' and the subsequent deco of 16 +/- hr, here is what we had: > The teams CNS O2 Toxicity Clock what somewhere between 15 to 20,000 > percent of maximum, the same "clock" was used. I give you the range due to > fact that we can not calculate the back gas breaks used, this prevents us > from giving a truly accurate number. Never the less, this is a value well > over the established "limits" as expressed in the clock. The deco was all > done in water/trough/habitat, not in a saturation chamber or transfer > bell. There was not one incident of CNS toxicity. > The daily dose limit of OTUs was reached before the 190' deco stop. I > did not calculate the time remaining from there, but I would say approx 14 > hr or deco were left. Only very minor occurrence of mild pulmonary > tox. Compared to the dives of prior years this was not a problem. Again > back gas breaks and correct gases are the key. > The room full of physicians and chamber operators did not believe us > either. There were a few that had their interest sparked, but it appeared > as if the world of diving medicine was not ready for us. > What can you learn from this long winded chat, take religious back gas > breaks during deco, use the correct gases, and know what you are doing. I > am not recommending that anyone just blow this stuff off because a few > people did it w/o problem. Stay w/ in your limits and dive safe, just be > sure to also dive smart. > Have a nice day, > Scott Hunsucker > At 09:00 PM 02/08/2000 -0500, Martin M. Quigley wrote: > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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