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Hi David,

On April 24 David Drake wrote:

> I have done a considerable amount of decompression diving 
> in the Lakes that didn't need very aggressive decompression.  
> So I carried air down and used a big pony for deco and 
> bailout if required.  

My opinion is this: Pony's don't usually carry much volume -- 13-30 cu. ft.
is typical. If a diver plans the pony for use during deco and the pony fails
in some way, then there probably won't be enough gas left in the main
cylinder to carry the diver. I think the best use of a pony in the scenario
you describe is for emergency purposes only. Decompression diving is no
different than any other type of overhead environment, i.e. if you can't make
a direct, continous ascent to the surface then at least one level of
redundancy is required on all critical components.

Win Remley
Co-Publisher, DeepTech Journal
deeptek@ao*.co*

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