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DM>What is the basis for this statement? Nitrox and TriMix are clearly safer
DM>gases at their respective depths. Why is moving from OW towards mixed gasses
DM>rather than from OW to deep-air lacking in self-discipline [implied].

Mind if I butt in? Good. 

Nitrox and TriMix are safer if used properly but often someone
who desires to go deeper is fresh from some poor excuse for
advanced open water training and IMO are not ready to deal with
the complexities involved with calculating MOD's, PPO2, EAD, etc.,
let alone thinking about gas switches and complex deco's.

On top of that there are some people who may not have the 
ability or desire to task themselves but are perfectly safe
diving 160' on air. For myself narcosis is not a problem
until 180 and then only half the time and the PPO2 is
still safe by the standards people wish to force on everyone.

For those willing to foot the bill, lug the gear, and complicate 
their dives mix is a great tool, but for many people dives in
the 130 - 200+ range are enjoyable and safe. The safest way
to go would be a rebreather that constantly maintains your
PPO2 at a level more in line with the .21 ATA your body is
designed/evolved to breathe. Of course, most of us can't
afford those devices and do the best we can (within reason).

Thanx.

MRWConsult@ex*.co*             /\/\/
---
 � DeLuxe� 1.25 #11829 � Plan the Dive - Dive the Wreck - Wreck your Plan
!

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