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Barrie sent me the following comment:

> I would point out one other issue with this.  Not everyone will react to 
> CO2 the same way.  Along time ago (when we had to illuminate our dive
computers
> by candle light because electricity hadn't been invented ) I was part of a 
> study looking at the effects of CO2 build up on respiration in underwater 
> hockey players. The effects where quite striking in everyone except one old 
> diver who could hold his breath forever.  Even at very elevated CO2 levels 
> his respiration was uneffected.  As I recall they became concerned about 
> CO2 poisoning before he showed any respiratory symptoms.

I just wanted to say that this is an *excellent* point...I concur.  During
our initial training on rebreathers, we also noticed marked individual
variation for symptoms of Hypoxia as well.  These things all need to be
experienced several times under very controlled conditions so that each
person will know how his/her body responds.  Familiarity with these
symptoms can save lives. 

Aloha,
Rich


deepreef@bi*.bi*.ha*.or*

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