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        Reply to:   RE>>your mail 
>From memory (apologies if my brain scrambled the message, it has
>happened)... one of their points was that by decompressing
>on 50% O2, you get many of the benefits of decompressing on pure O2
>(i.e. deco times were pretty close) with a gas that you can use
>as deep as 70' and none of the hassles and/or dangers involved
>with pure O2.

Hmmm... thinking about this assertion.  There seems to be a range
hovering at about 1.2-1.4 ATA, ppO2 in which O2 toxicity appears.  At
50% O2,  79 fsw gives you 1.2 ATA ppO2.

What you are proposing, really, is using EAN-50 Nitrox for decompression.  I
think I would probably be willing to use that mixture starting at, oh, say,
66ft for my decompression, giving me a 1ATA ppO2.

(note that I'm not a proponent of Decompression on pure O2 anywhere but
at the surface, so perhaps I'm just a bit too cautious).

       -- Kevin --

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