>
>  Afaik to avoid losses one expands
> the gas through a machine, not through a simple nozzle, and uses reheating
> (from
> ambient air at least, but better with fuel). I don't know how they
> calculated
> the efficiency on that thing because storing compressed air is quite
> wasteful
> (by losing the heat of compression among other things).



Subs usually have a fair amount of compressed air handy, if they want to
come back up :)
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