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Hello, On a recent dive trip visiting divers were making deep stops when using Trimix. Until now I have always followed the deco schedule provided to me by my diving software. Depending on the dive, I carry a pony bottle between my doubles with Air. As I pass the 200 foot mark I'll switch to air just as a buffer - this switch is not in the dive plan and I don't include it in the deco profile. Generally, I don't waist any time getting to my first stop. Depending on the dive, I'll travel at 100 fpm to around the 120 foot mark. The divers on this trip were halving their bottom depths and doing 2 minutes before proceeding to their first required stop. For example, on a dive to 250 feet for 20 minutes (using a 17/35, 40% and 80%) they would stop at 150 feet for 2 minutes. When I plan a dive to include these deep stops there doesn't seem to be much difference in the overall dive time, CNS% or OTU values. Also, I can't find much literature to support the additional safety factor that this practice is supposed to provide. I assume that the deep stop allows better (slower or more consistent?) off-gassing of the fast tissues and therefore limiting the potential of a hit involving CNS - a serious problem. Any thoughts... -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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