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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

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