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Hi

I've been listening into the techdiver distribution list for a month 
or so now, and I'm finding it an interesting forum for extremely 
technical matters. 

First of all, a brief introduction...  I've been diving now for 7 
years, and have done goodness knows how many dives under varying 
conditions, most of which have been on the South Coast of the UK and 
in the North Sea (yep - the North Sea really does turn blue.  Just 
ten...).  Almost all of the diving I've done has been in 
cold water in limited viz.  I am qualified to SAA Club diver 
standard, but was originally trained under BSAC to Sport diver 
level.  

Up until recently, I was happy accepting the statements of 
the various diving organisations and so was not particularly 
interested with the technical side of diving as such - just how to 
stay safe underwater.  Consequently, my theoretical knowledge of the 
physics/biology of diving is limited.  However, having recently 
(accidentally !) discovered that the RNPL/old BSAC deco tables 
(based on the Haldane model, I believe ?) are potentially 
dangerous, I am now more than a little bit cynical about a dive 
organisation's ability to keep their members informed of what is 
going on !  So here I am, to listen, learn (hopefully) and give help 
when I can.


Intro over.  Now a question for the decompression modellers based 
loosely on the recent thread of repetitive diving.  The old RNPLs 
put a no decompression limit at 9m, other tables put it at lower 
limits (5 m on the BSAC '88s/Buhlmann ? - I haven't got any tables 
handy).  

Based on current knowledge, what is the safe depth to carry out 
numerous ascents (eg lots of training drills) ?  Please note, I'm 
not looking for what the tables say (I can read tables - honest !).  
I'm trying to find a definitive answer based on knowledge, 
experience and gut feeling.

Also, can anyone advise me on just how the Haldane model fails 
in layman's language.  Is it safe to use the RNPLs under restricted 
conditions ?  (Eg, depth limit of 30m, no repetitive dives, 10 m/s 
ascent rate etc).  (some scuba-l subscribers may remember my 
original post on a similar subject some time ago - what I need now 
is a more technical comment on the subject).


Thanks in advance for your help and comments.


Chris

PS : my personal e-mail address is "cpitts%galaxy@ax*.bt*.co*.uk*", 
and NOT as found in the e-mail header (a quirk of our system which 
we're trying to fix).  If you try to "reply" to a message 
personally, then it will be bounced back unless you change the 

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