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Hey Ronald, You have just touched upon the importance of decompression gas when doing decompression diving. The way to ensure you don't run into problems like the one you mention is to not lose your deco gas. When I do dives like the one you mention I either keep my deco gas one my person, or it is tied off on the wreck right next to my primary tie off. In this way you always ensure that you can return to you deco gas. Each deco gas is calculated using the rule of thirds just like your back gas. In this way you have enough extra deco gas for your buddy, or for contingency plans in case you over stay your plan because you got stuck, lost the line whatever. So... Make sure you don't lose you deco gas. Don't tie it off on the anchor line, don't hang it under the boat. Keep it on your person if possible. If not, tie it off at the point of entry or just inside the wreck. This way you avoid having to do goofy calculations for the "new" rule of fifths. Mat. Ronald D Thompson wrote: ----------------------------------------------- My original query which began this thread stemmed from my thinking about the following scenario: Each of a pair of air divers descends with two deco mixes, and removes both deco bottles and leaves them on a wreck at the point the buoy line ties into the wreck. The pair penetrates the wreck via an access point nearby. At the turn-around point deep inside the wreck, one buddy loses *all* of his/her backgas. Upon exiting the wreck, the now air-sharing buddies cannot locate their four deco bottles (or the buoy line). The buddies must now make a free ascent, blow a bag, and deco on one diver's remaining air. _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.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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