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Come on now Dan, Tri mix for a recreational dive to 80-90 ft?? So... just in case the diver can't control his/her depth. They will now need to carry doubles in case they go too deep (and you also gotta have enough gas for the rescue). Two deco mixes (50/50 and O2) cause 80/20 is "stroke mix" (rescuing someone at 190 is gonna get you into deco). How about a canister light. If they gotta go down to rescue someone you're gonna need to be able to see. Oh, Oh! don't forget the rule of thirds. Make sure you plan for that extra gas for.... Actually if you have to rescue someone you better plan for a new rule maybe the rule of fifths. That way you have enough gas to get down to rescue someone at 2-3 times the depth of your dive plan... and make it back. Yep, you sure got it all figured our Dan! Hey Dan, come to think of it what's the safe depth limit for your free diving? Can you imagine what would happen if you got hung up on something at depth? You would drown. I can't believe you even attempted this. This is the height of strokery! You could die? What agency told you you could free dive to 50 feet? You only have enough gas for one breath for god's sake!! Yep, Maybe recreational divers should not be able to dive in anything except swimming pool water that's no more than say 10 feet deep. Ya! that's it. Come on Dan. Safety yes, but now your gettin' just a bit carried away. Divers need to be at least partially responsible for themselves. This isn't even a training situation we're talking out here. Let's face it at some point you're going to be adding more risk by trying to remove risk elsewhere. I though you understood DIR. One of the concepts is to use the minimum required equipment. In this case trimix doesn't decrease the risk at all. -------------------------------------------------- Dan Volker wrote: Jim, Blue water dives do not require 100 foot depths. 30 or 40 feet is plenty. For this, air would be my choice. Most of the time I do this stuff, I freedive it---no tank at all, drop to 20 to 50 feet, and just hang in the collumn. Nitrox would be impractical here for many reasons. Particularly for the recreational diver whose depth monitoring skills are "challenged" at best, even on a wall dive, a nitrox mix which limits them to 80 or 100 feet is dangerous at best. If they "think" they can do 90, they may end up at 140 after only a few moments of watching a big pelagic. If the concept or plan of the dive was to do 80 to 100, then 190 foot trimix would be a smarter plan. Regards, Dan _________________________________________________________ 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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