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On Mon, 12 Jan 1998, Greg Kuiper wrote:
> I still would like to know what is considered excessively
> deep on trimix by experienced trimix divers.
>
There's no real limit - unlike air, where there are
definite operational depth limits because of
O2 and N2 under pressure, with trimix, these 
factors are completely controlled during dive planning.

So the emphasis shifts from "what's too deep" to
"what's a reasonable logistical/expense limit
for a given objective".

HPNS is the primary concern actually related to depth,
but commerical divers have done 2000+ ft,
(habitat or surface-supplied).  For SCUBA, the issues 
become exposure, logistics, gas-planning/management,
and expense.   For really long decompression profiles,
oxygen toxicity also re-emerges as a real concern, due
to long exposure times at moderate PO2's.

-Will
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