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--------------7644E7653858B9DA10E59958 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Capt JT wrote: > At 03:22 AM 1/18/99 +0100, you wrote: > >> When i started the discussion i was not referring to 400 feet dives >> in strong currents. I was referring to my every week end dives which >> is to 200 feet for 15-20 min in no currents. In the case of this >> kind of diving with less than 20 min of deco in no currents and in >> the conditions we dive you would drift at most 100m during your >> deco. 2 boats would bee good to have but not necessary to do it >> safely. > > > > > In the past I may have agreed with you here,but of late I have seen > where a chase boat would be of good use in all deco diving no matter > what the depth, but sometimes it is not available and yes I would do a > dive with out it ,but the boat does not leave all for the one ,he will > be got after the others are on board ,they did not cause his > problem,if he is having a life problem then you must go and if > something happens to the others you will look foolish. > > > > >> What problem did you have? The CO2 problem from swimming in >> currents at 400 feet i have solved with buying a Gavin scooter and >> getting in better shape. Swimming at 400 feet is not a good idea in >> my experience. Several divers had problems on the britannic 1997 >> expedition. I have done many cave dives to 300 feet and never had >> any problems with CO2 but 400 feet and strong currents was a >> different thing. The descent was really tiring as well, we had to >> work hard to get down due to the current and that helped building up >> CO2. Scooter is the way to go for these kind of dives. Not only >> does it eliminate any CO2 problems you can cover 5 times more of the >> wreck in a dive and the speed also means an added safety factor. > > You should know that CO2 can be a problem at alot less than 300ft > ,doing work of any kind which I consider swimming work ,will cause > problems ,the belief that one can skip breath to save gas will I > believe, cause CO2 problems.I would like to answer openingly in > details of the CO2 problem ,but I did send some of it to you privately > ,I can not disclose any details as I sign a contract before the dive > not to , but let it be said those in charge of that dive have never > been on the boat since. �es you can get Co2 problems on shallow depths too if you work hard but you will more easily get it on deeper dives. High helium content is another thing that helps eliminate C02 problems in my experience. I do not know if there are any scientific support for this though. I always try to have very rich Helium mixes. > > > Also I do not believe in colors underwater,you did chose only two and > yellow being one it was a safe choice ,but you know that a diver under > stress would have sent the first bag up he got his hands on ,and that > may have sent the wrong message up.Any bag to the surface from that > dive should be a message that they need help and two divers with extra > gas should go down, with one to stay and one to come back and tell > the surface what is wrong.Stress is big problem and should be taken > away from the dive ,having to send up the right colored bag adds more > stress to what ever problem you are having ,any bag of any color on a > dive like that is a message for help. > Yes you might bee right here. If your read my post again you will se how ever that the red bag meant drop station down and also safety divers. The yellow bag meant only safety divers down and no drop station. The safety diver carrying extra gas of course. I do agree that this was a bit of over planing. We would possibly have been better of skipping the yellow bag. Simplicity is something to strive for in a good dive plan and this was a bit to complicated. Regards, Ingemar --------------7644E7653858B9DA10E59958 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <HTML> <P>Capt JT wrote: <BLOCKQUOTE TYPE=CITE> At 03:22 AM 1/18/99 +0100, you wrote: <BLOCKQUOTE type=cite cite><FONT COLOR="#006600">When i started the discussion i was not referring to 400 feet dives in strong currents. I was referring to my every week end dives which is to 200 feet for 15-20 min in no currents. In the case of this kind of diving with less than 20 min of deco in no currents and in the conditions we dive you would drift at most 100m during your deco. 2 boats would bee good to have but not necessary to do it safely.</FONT></BLOCKQUOTE> <BR> <P><FONT COLOR="#000000">In the past I may have agreed with you here,but of late I have seen where a chase boat would be of good use in all deco diving no matter what the depth, but sometimes it is not available and yes I would do a dive with out it ,but the boat does not leave all for the one ,he will be got after the others are on board ,they did not cause his problem,if he is having a life problem then you must go and if something happens to the others you will look foolish.</FONT></BLOCKQUOTE> <BLOCKQUOTE TYPE=CITE> <BR> <BR><FONT COLOR="#000000"></FONT> <BLOCKQUOTE type=cite cite><FONT COLOR="#006600">What problem did you have? The CO2 problem from swimming in currents at 400 feet i have solved with buying a Gavin scooter and getting in better shape. Swimming at 400 feet is not a good idea in my experience. Several divers had problems on the britannic 1997 expedition. I have done many cave dives to 300 feet and never had any problems with CO2 but 400 feet and strong currents was a different thing. The descent was really tiring as well, we had to work hard to get down due to the current and that helped building up CO2. Scooter is the way to go for these kind of dives. Not only does it eliminate any CO2 problems you can cover 5 times more of the wreck in a dive and the speed also means an added safety factor.</FONT><FONT COLOR="#000000"></FONT></BLOCKQUOTE> <P><FONT COLOR="#000000">You should know that CO2 can be a problem at alot less than 300ft ,doing work of any kind which I consider swimming work ,will cause problems ,the belief that one can skip breath to save gas will I believe, cause CO2 problems.I would like to answer openingly in details of the CO2 problem ,but I did send some of it to you privately ,I can not disclose any details as I sign a contract before the dive not to , but let it be said those in charge of that dive have never been on the boat since.</FONT></BLOCKQUOTE> Ýes you can get Co2 problems on shallow depths too if you work hard but you will more easily get it on deeper dives. High helium content is another thing that helps eliminate C02 problems in my experience. I do not know if there are any scientific support for this though. I always try to have very rich Helium mixes. <BLOCKQUOTE TYPE=CITE> <FONT COLOR="#000000"></FONT> <P><FONT COLOR="#000000">Also I do not believe in colors underwater,you did chose only two and yellow being one it was a safe choice ,but you know that a diver under stress would have sent the first bag up he got his hands on ,and that may have sent the wrong message up.Any bag to the surface from that dive should be a message that they need help and two divers with extra gas should go down, with one to stay and one to come back and tell the surface what is wrong.Stress is big problem and should be taken away from the dive ,having to send up the right colored bag adds more stress to what ever problem you are having ,any bag of any color on a dive like that is a message for help.</FONT> <BR><FONT COLOR="#000000"></FONT> </BLOCKQUOTE> Yes you might bee right here. If your read my post again you will se how ever that the red bag meant drop station down and also safety divers. The yellow bag meant only safety divers down and no drop station. The safety diver carrying extra gas of course. I do agree that this was a bit of over planing. <BR>We would possibly have been better of skipping the yellow bag. Simplicity is something to strive for in a good dive plan and this was a bit to complicated. <P>Regards, <BR>Ingemar <BR> </HTML> --------------7644E7653858B9DA10E59958-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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