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Horizontal, not supine. This is due to uneven pressure in the water
column over the length of the body. If you were in a chamber, for
example, it would make no difference. This also causes the lungs to
operate unevenly, and to perfrom less well as a filter of bubbles on the
venous side and less area is evenly open and pressured for gas exchange.

In general, you will find that divers who do everthing carefully and
with an eye towards practicing the skills in all situations have less
problems in all areas of the activity, and this is merely one small
example.


Michael A. Graham wrote:
> 
> George,
> I found this quote, attributed to you, @
> http://www.cisatlantic.com/trimix/trimix.html
> 
>     "...The correct body position for diving and decompressing is always
> supine, not vertical. To be vertical is an         invitation to DCS..."
> 
> I understand the rationale concerning diving position but what is it about
> being vertical during deco that increases the risk of DCS?  I've never heard
> this perspective nor have I ever seen it practiced.  My diving is limited to
> OW ocean and OW Great Lakes, but I can't see that this practice would be
> unique to cave diving.
> 
> Would you help me to understand this?
> 
> Thanks,
> 
> Michael A. Graham
> "All great truths begin as blasphemies." - George Bernard Shaw


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