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>>I wrote:
>>
>>The actual operational risk may in fact be less than open circuit, I 
>>doubt it, but thats something that time will tell.
>
>Chris wrote:
>
>I think that the balance is probably in favour of closed circuit in
>respect of time pressure.

The question is weather you will know when something has gone wrong.  
If not, time to react is moot.  There are quite a few failure modes 
with little in water warning, for example variation in intermediate 
stage preasure or blocked flow restrictor.  Even out of gas gives less
warning with a semiclosed constant mass flow rebreather than open circuit.  

Barrie Kovish
Vancouver, Canada

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