Hi Sean,

> To get a bit more specific, assume your buddy has a problem that
> requires you to accompany him to the surface to hand off to medical
> attention, but then you are asymptomatic and can return to depth
> immediately (say, one minute or less surfaced).  This actually happened
> to me once.  What I did, after notifying the surface of my intent, was
> return to 5/4ths of the violation depth, and then resume the deco
> profile from that point with no extension of stop durations, other than
> the oxygen stop (6m) which I extended by 50%, still including breaks to
> back gas.  A safety diver came down to monitor me, and brought extra
> oxygen, although I only used what I was already carrying.  Got out
> feeling fine, apart from a bit of fatigue, as if I had done the dive on
> air  (sub-clinical DCS?).  Does this approach sound reasonable, or do
> you have a well defined reason to extend the non O2 stops as you
> suggested?

No, I think that sounds perfectly reasonable to me.  Anyone who thinks they
have a "more correct" approach is suffering from "Sheila Syndrome".  There
would be lots of other ways to do it that are likely equally reasonable.
There is an interesting case of a diver doing an explosive ascent to the
surface from 220 or so, who opted for a modified Australian IWR (modified in
only descending back to 20 feet, instead of 30 feet), rather than returning
to the deeper ceiling that was violated (let alone deeper than the initial
violated ceiling).  This was done even though no symptoms were encountered
prior to IWR. The outcome was reasonably good (apparently some minor
symptoms diagnosed upon later reaching the chamber).  The point is, despite
the vast variety of responses to symptoms (IWR) and aniticipation of
symptoms (omitted deco), the vast majority of such attempts seem to do more
good than harm.  There simply isn't enough reliable, controlled data out
there to be any more precise.

Hope that helps!

Aloha,
Rich

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