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To everybody,

I have been shown 2 different regulator configuartion for rigging twin 
cylinders. At this point I do not wish to discuss pony bottles, deco bottles, 
long hoses, manifolds, etc just the regulators on the 2 cylinders containing 
the bottom mix.

For many years I was told that the reg not in your mouth was the octopus or 
that you donated the one in your mouth and you swapped to the other reg. 
Recently I was told that this  was not a good idea and that one of the 
regulators should have  2 second stages with the second one available for your 
buddy should they need it.

The second system sounds like you could easily end up with 2 people breathing 
from one cylinder and then being left with 1 second stage between 2 people.

If you could comment on either method I am interested to hear your points of 
view.

Also are there any documented studies or tested procedures on what a diver 
should do if they mistakenly omit a deco stop(s)  and then realise their error 
either before or after surfacing and there is sufficient gas.  I am already 
aware of the old Navy ommited deco procedure.

David O.

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