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As near as I can guess from what I have *seen* the risk of DCI is probably between 2 and 10 percent for dives on trimix around the 80 metre mark. I know that the Americans claim fantasticly good safety records with mix but I also know that Americans as a rule (don't you just love sweeping generalisations) tend not to report/admit to DCI. The culture there seems to regard DCI as a "mistake" on the part of the diver. Virtually everyone I know who dives mix has been bent. (not Richard Taylor) I have been hit on mix, and in response to the question about variations from day to day, I was hit on a profile that I had dived the week before without problems, and I dived it again a few weeks later without problems. A risk of 2 to 10 percent is comprable with USN air tables, so it they were ok for you then you should have no problem accepting the risk of mix diving. Cheers Jason O-) PS. Have plenty of o2 on hand, not just at the dive, but with you for 12 hours. > > > Dear All, > > A quick question I hope some people can shed some light on. In the pub > last night, we got into a discussion on the safety on various mixed gases, > with one person contending that Trimix was a 'dodgy' gas, in as much as > tracking the absorbtion/release of one inert gas was hard enough, never mind > two going in and out at different rates, each possibly affecting the > behaviour of the other. His argument was that Trimix divers 'covered > themselves' from the problems this causes by using pure O2 for > decompression. > > Now all this sounds plausible, yet I seem to remember seeing statistics > (can't remember where, but may have been an old issue of Aquacorps) that > Trimix had an excellent safety record. So (finally!) the question is : > > 'Does anyone have any facts/figures about the safety of trimix, and the > incidence of DCI when using it (that is "undeserved" DCi, as opposed to DCI > after a blowup)?' > > Thanks for your time. > > Iain Robertson > robertsoni@ol*.ag*.bt*.co*.uk* > -- > Send mail for the `techdiver' mailing list to `techdiver@opal.com'. > Send subscription/archive requests to `techdiver-request@opal.com'.
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