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> 
> 
> > 	The absolute production of CO2 is metabolism related - since
> > this is not depth related, the amount of CO2 remains the smae regards of
> > depth (since you are breathing out, the ppCO2 in you lungs at 40m, 80m
> > or 0m is the same).
> 
> This line of reasoning has always seemed correct and logincal to
> me but it is not my experience.  At depths of 100' and deeper,
> I feel that I am in total control of my breathing.  I can slow
> down my breathing to rates at which I get headaches from high
> levels of CO2 in my blood, perhaps 1 - 1 1/2 breaths per min.
> My understanding is that these headaches are caused by dialation 
> of blood vessels in the head from high ppCO2 in the blood. 
> (Am I wrong?)  These headaches  disappear soon after increasing 
> my breathing rate.  This slow breathing is done without any 
> feelings of discomfort and feels natural and relaxing.  It does 
> require some level of awareness of my breathing but this is
> always true when I dive.   Is this unusual?
> 
> 
> Philp Weissman
> 
> 
> 
> 
>

	I don't *know* about usual, but yes, it's my experience and that
of many companions to 40m+ (my max is only 54m so I feel a bit of a
flake on techdiver, but f.u. etc :-) ). We have come to the conclusion,
and a long considered one, that it is an effect of narcosis. On the odd
occasion when one of us has had a really bad narc down there, the
reverse has been known to happen, where someone feels utterly out of
control on their breathing. Not nice, time to call the dive, really.

	Jason.


>    
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