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Carl Heinzl wrote:
> 
> 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.
> 
I'm not sure I agree with that.  In theory, EAN50 looks great.  In a couple
applications I've seen doppler scores for EAN50 divers come up worse than
for O2 divers on two occassions.  I admit, that this data is FAR from 
anything you could call conclusive - the divers were of varying ages,
different %body fats, using different deco models, etc - but it made an 
impression on me.

Also, saying that EAN50 has "none of the hassles and/or dangers involved
with pure O2" is misleading, and dangerous.  A diver decompressing on EAN50
must still track his O2 clocks; there's still the risk of oxtox; and 
there's still the same 'human-error' danger if the diver inadvertently 
switches to a EAN50 below its MOD.

regards,
GregD

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