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> George,
>
> am interested in understanding what
> you mean when you said
>
> > you have no idea what the damage is from air diving

  Red blood cells are biconcave disks that fold when needed to pass through
the smallest capillaries, many of which supply the "fastest" tissues ( the
best perfused). Nitrogen under pressure causes a surface tension effect on
the red cells which makes them rigid, and they then either will not pass or
they trigger the stretch receptors in the capillaries and thus a whole
litany of immune system reactions, which then effectively shunt the blood
away from or around these areas and results in dcs and dcs-like symptoms,
often referred to as "flu like symptoms" which are actually far more
insidious.

Helium in sufficient amounts seems to ameliorate this effect. The stronger
the mix, the less the effect.

Deep air diving is like giving yourself a case of Cycle Cell Anemia - that
is what happens when cells "cycle" and explains the pain that its victims
feel, as well as the loss of capacity associated therewith.

Just one more thing that the dumb fucks that teach diving don't bother
telling you. Great bunch. This is right up there with "unearned hit" in the
irresponsible, cavalier disregard for human life displayed by the dive
"instruction" agencies, especially the ones who teach deep air, require deep
air, and used to require much deeper deep air until they lost a few
lawsuits. This shows you how fucking stupid some of these idiots really are.

My cave instructor made me watch a film on how it works , so I got saved
form it years ago. His favorite saying to me ( besides "Don't Break Rule
Number One")  was "I am going to teach you real world, and if you tell
anyone I did any of this, I will have to  deny it". You see , he was my
friend, not just my instructor. I got lucky, you got fucked.



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