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	wrt O2 clock units; I suspect that they are qualitatively
similar to any agencies depth limits. That is to say, the group setting
the limit (depth or O2 exposure) studies the statistics available (and
in the case of the Navies, generates them) and selects a risk level. The
information we get handed on is just - this is the limit; not what
happens on either side of the limit (i.e. massive sudden increase in
risk if you push it a little way, or just a steady worsening...).

	So you fuck with it at your own risk after finding out as much
as possible about the 'other side' of your limit. And this forum, I
would guess, is a good place to start.

	wrt Navies attempting to produce individual O2 profiles, I
thought they gave that up in WWII. They used to put divers in wet tanks
and drop them to 70fsw (or further) until they got O2 hits. Partly to
find out when it happened (effectively random with each diver on each
dive I gather), but largely to teach the divers what 'lips' felt like,
and what happened if they ignored 'lips'! (Royal Navy, this is).

	Fascinating and much ignored piece of Naval history...

	Jason.

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