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Trimix does not neceassarily mena reduced oxygen. Where does this stuff come from? - G Jason Reese wrote: > > > Trimix is generally never used shallower than 100-120 ft. Depending on the > mix you could die of asphyxia at shallow depths with trimix due to the > reduced oxygen. > > -- Jason > > At 09:20 PM 10/15/97 EDT, Hans Petter Roverud wrote: > >Somebody stated: Technical trimix is a deep air > >course. I believe he's right -- this course is > >definitely bordering on the "deep air" that most > >most of us agree to avoid. > > > >My deepest "technical nitrox" dive was a nitrox > >23 dive to 160'. Of course, 23% oxygen is > >a ridiculous mix since it's not worth the effort, > >but the point was to practice making EAD calculations. The > >purposes of "technical nitrox" are to learn gas > >management, practice swimming with a heavy rig > >and practice gas switches. > > > >My question to the board is, what do you think > >would be the preferred depth limit? We definitely > >do not need "level stoned" yet we do want a > >realistic task loading, deco obligation included. > >I would suggest 130' as a good target depth for > >"technical nitrox" -- it's enough to provide a > >realistic training scenario for future trimix divers, yet > >narcosis is not a problem. > > > >However, as a physiologist I know that narcosis > >can be measured at depths shallower than 100'. If > >we demand no narcosis whatsoever, we really have > >to pull back. What is a reasonable EAD for a > >trimix dive? Ask some and the answer is 200' -- > >ask others and they go 100'. Ask me and you get > >100' - 130'. I believe the "technical nitrox", > >"extended range air" or whatever you call it > >should have a target depth matching the EAD you > >will prefer as a trimix diver. Learning the > >toting, configuring, switching and balancing > >the rig does not depend on going deep. Actually, > >some of the best training may be to swim > >sidemounts for an hour at 20'. > > > >I think most of the current philosophies are > >based on giving students a taste of narcosis > >and prove the need for trimix. I believe most > >of today's trimix divers have thorough > >knowledge of nitrogen narcosis from past > >experience. > > > >Discussing this with some friends, > >the opinion was voiced that past deep air experience > >might be an advantage. I half-heartedly > >disagree. Sure, it may be sort of an advantage > >to have been there and know what to avoid, but I > >don't think new trimix divers need to go > >through the same phase of trial and error. In > >retrospect, an advantage but no prerequisite, and > >definitely not the direct way to learn trimix. > >We need to build a record and gain experience > >underwater doing what we're supposed to do. If > >trimix is the tool of the trade, it makes a lot > >more sense to log more trimix dives than it > >does to practice deep (or even deepish) air > >dives. > > > >My conclusion: 130' is a good target depth for > >practicing and preparing for trimix. What do > >you say? > > > > > > > > > > > >-- > >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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