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Yesterday, when I found myself doing it, I realized that you are most at risk when you are done with your dive. You might be tempted to surface and then descend again to a shallow depth (5-15ft) to swim back to the exit. What I think I did was to permit bubbles to form and travel to the lungs and then when they were there I descended and made them smaller or able to dissolve and pass on through to the heart and the arterial side. Not too bright when I think about it, but people do it all the time. I'm thinking that once you surface, that should be it - dive over. The computers should start flashing and beeping if you decide to descend again and they should not continue to monitor the dive. If there was ever a deco violation, that would be it. At least 30 minutes would need to elapse before you could descend again. > -----Original Message----- > From: George Irvine [mailto:George-Irvine@em*.ne*] > Sent: Wednesday, June 06, 2001 7:11 PM > To: Kevin Sumlar; techdiver@aquanaut.com > Subject: Re: bouncing - the risks (was RE: Diving after BENDS) > > > Absolutely. > > > ----- Original Message ----- > From: "Kevin Sumlar" <ksumlar@ci*.co*> > To: <techdiver@aquanaut.com> > Sent: Wednesday, June 06, 2001 9:43 AM > Subject: Re: bouncing - the risks (was RE: Diving after BENDS) > > > > Very informative post. One question about this, > > > > Could you also get bent like this doing non-deco > > training dives? > > > > For instance, say I am at the quarry practicing with > > a new lift bag in 50' of water. If I stay in no-deco > > time limits but am going from 50' to the surface multiple > > times in a short time period would this expose some > > sort of risk of CNS DCS? > > > > -K > > > > ----- Original Message ----- > > From: Simon L Hartley <shartley@sc*.ed*.au*> > > To: <techdiver@aquanaut.com> > > Cc: <trey@ne*.co*> > > Sent: Tuesday, June 05, 2001 7:38 PM > > Subject: FWD: bouncing - the risks (was RE: Diving after BENDS) > > > > > > > >Return-Path: <owner-techdiver@aquanaut.com> > > > >Errors-To: owner-techdiver@aquanaut.com > > > >From: trey@ne*.co* (Trey) > > > >To: "Wkpp@Ya*. Com" <wkpp@ya*.co*> > > > >Subject: bouncing - the risks > > > >Date: Tue, 22 May 2001 07:30:58 -0400 > > > >X-MSMail-Priority: Normal > > > >X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 > > > >Importance: Normal > > > > > > > > > > > > Guys read this for once. > > > > > > > > WHY WE DO NOT BOUNCE DIVE AFTER DIVING IN THE WKPP > > > > > > > >It is ok to offgas from the tissues into the blood > stream in bubble > form in > > > >the later steps of decompression as it is a more > efficient, faster way > of > > > >getting rid of the remaining gas ( by reduced pressure ) than by > elevated > > > >oxygen alone ( which starts taking exponentially more > time with greater > > > >risk) . However, this depends on having a good lung filter and no > shunts. > > > >All of you have been PFO tested if you are diving with us. > > > > > > > >The correct way to ascend from the last stop is one foot > per minute for > the > > > >bigger dives. > > > > > > > >The greatest potential for offgassing in bubble form is when the > pressure is > > > >totally removed back to one ATA out of the water. Now > you get a real > shower > > > >of bubbles , relative to what was happening in the > water. A good , > clean > > > >deco with the foot per minute ascent reduces this dramatically . > > > > > > > >In MOST people, the greatest bubbling occurs out of the water and > continues > > > >for up to four hours, not even peaking for a couple of > hours. In a well > > > >vascularized, fit person like me, it is over with in 30 > minutes. Don't > bet > > > >on that with most of you. > > > > > > > >In ALL people, the bubbles continue to grow in size > after the pressure > is > > > >off. They accumulate like gas into themselves from the > surrounding > blood or > > > >tissues ( if there are bubbles in the tissues or injury > sites ) and > they > > > >grow bigger. This is why you feel pain later rather than > earlier if the > > > >bubbles are in joints or tissues - they get bigger > before they begin to > > > >shrink. This is why what starts out as micro bubbles can > get by the > lungs > > > >and grow and get lodged downstream, and you get > neurological symptoms > later. > > > > > > > >Now here is the important part. If you understand > everything I have > said > > > >above, then you know that bouncing to 20 feet or > whatever to pick up a > > > >bottle and immediately returning to the surface is the > like giving > yourself > > > >a home-made PFO: the bubbles in the venous side compress > enough to get > past > > > >the lungs and then will reexpand on the arterial side > and lodge in the > worst > > > >places , the spine and brain blood supplies. You do not > want this. > > > > > > > >If you dive after dive, stay down and let everything > reset. Get the > bubbles > > > >all compressed, and then deco out and ascend accordingly. > > > > > > > >I do not want support divers diving support within four > hours of doing > a > > > >real dive or deep support. This works out fine, since we > have support > > > >activities lasting up to 18 to 24 hours and need to > rotate everyone. > > > > > > > >Let me assure you that we have found this out the hard > way in the past. > > > >Parker used to get hot as hell when it would happen. In > those days we > had > > > >"volunteers", and they would all get bent diving to 20 > feet to pick up > > > >bottles. We have also seen some severe cases of this > where dives were > done > > > >away from the project with no support, and the players > went back for > bottles > > > >later and got hammered. > > > > > > > >Don't do it. Also, obviously, do not freedive after a > dive. When you > want to > > > >freedive, do that first and then go scuba diving. > > > > > > > >Any questions from WKPP guys? > > > > > > > >-- > > > >Send mail for the `techdiver' mailing list to > `techdiver@aquanaut.com'. > > > >Send subscribe/unsubscribe requests to > `techdiver-request@aquanaut.com'. > > > > > > > > > > > > > > Simon > > > > > > Simon L Hartley > > > RSM Website Coordinator\First Year Course Coordinator > > > Associate Lecturer > > > School of Environmental Science and Management > > > Southern Cross University > > > P.O. Box 157 > > > Lismore NSW, Australia 2480 > > > Ph: (02) 66203251 or (61 66) 203 251 > > > Fax:(02) 66212669 > > > E-mail: shartley@sc*.ed*.au* > > > > > > http://www.scu.edu.au/schools/esm/staff/pages/shartley/ > > > > > > http://www.scu.edu.au/schools/esm/ > > > -- > > > 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'. > > > > -- > 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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