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On Tue, 14 Nov 1995, Doug Chapman wrote: > On Nov.14, Ken Sallot wrote: > >.... Your back is bottom mix. Nothing else. This way you know whats > >on your back..... > > Not necessarily so old boy! Depends on the planned dive profile. Its > not unusual to put bottom mix in a stage with air on the back for dives > of about 300ft or shallower, especially for wreck diving. If you get > blown off the wreck (just say no!) and cannot make it back to any > staged deco gas, then its a lot shorter deco on air than trimix, as you > drift along on your lift bag. Hopefully you do have a lookout on deck > who can muster the chase boat which can drop some nitrox and O2? > > Doug Chapman > -- Let me get this straight. You carry your bottom mix in a stage bottle? Are we to assume that if it fails, you switch to the back gas, and this being air you will be able to handle the on coming slam that will hit you in about 30 seconds? This practice has contributed to the death of one cave diver that I know of. I realize that wreck divers are immune to the same things that kill cave divers, but he was both. Not good, not good at all. I don't care how much extra gas you have to carry. Bottom mix must have a redundant regulator. Tied around your neck works well. Not for your buddy. For you. Steve
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