Hi Scott,

Could you give us some more info and guidelines on planning o2 breaks for
shorter
exposures- 30-50 mins of o2.

Regards,

Simon Murray


----- Original Message -----
From: Scott Hunsucker <swhac@pc*.gu*.ne*>
To: Mike Rodriguez <mikey@ma*.co*>
Cc: <techdiver@aquanaut.com>; <cavers@ca*.co*>
Sent: Monday, April 17, 2000 4:54 PM
Subject: Re: Pulmonary Toxicity


>
> > >The addition of 25% He to deco gases, except oxygen, has decreased the
> > reported incidences of
> > >problems and discomfort that is traditionally associated with pulmonary
> > >oxygen toxicity; however, this step has the potential to increase thermal
> > >considerations and might extend decompression times--hence it would not be
> > >recommended for "average" dives.
> >
> >What do you mean by "this step has the potential to increase thermal
> >considerations"?
> Mike,
> The increase in thermal considerations is referring to the possibility of
> longer times in the water thereby exposing one's self to a greater heat
> loss through immersion and respiration.  NOTE:  This is relative to the
> chosen deco software, safety factors established, personal knowledge of
> physiology, etc.  For some people, due to varying combinations of the
> above, deco time is shorter, others it is longer.  Also note that this is
> done for much longer dives than most people will do.  Up to this point I
> have only spend 50 mins @ depth in Wakulla (approx 285) and have not had to
> do this.  Longer BT like 100+ min, at >285', might require such a step.  It
> was mentioned because it makes a difference and many varying people read
> this forum, chamber operators, sat divers, etc., perhaps others will
> benefit.  I WOULD NOT SAY THIS IS A NECESSARY STEP for most divers.
>
> >  Do you mean that breathing helium makes you cold?
> >I'm curious because the physics of the issue and practical experience
> >show that breathing helium *does not* make you cold.
>
> No, that is a very common topic though, and if I am not mistaken was just
> discussed on this forum recently.
>
> >  Adding helium to your drysuit makes you cold, yes, but breathing it does
> > not for many of the same reasons you shouldn't put it in your drysuit.
>
> This I agree with.  Next to He Ar is my favorite gas.
> Thanks for questioning and don't hesitate to ask more.
> Scott Hunsucker
>
>
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