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Pressure swings inside your s/m are unlikely to
be significant due to O2 metabolism and CO2 
absorption. It is routine to range between 
18-21% O2 and up to 2% CO2 inside a submarine 
pressure hull without too many problems. The 
thing that you have to watch is the internal
pressure doesn't drop too low as everyone falls
over due to low PPO2 - this should only be a
snag in a big boat where you are running 
compressors inside the pressure hull - probably
not the scenario here ! If you end up with too
much of a vacuum inside your pressure hull it can
make opening the hatch a bit of laugh when you
return to the surface if you have no way of 
breaking the vacuum via a hull valve. Might be 
worth doing a few calcs here but my gut feel is
that the dP will be piffling for short duration 
dives and a small volume pressure hull.

Might be simpler to just take a  battery 
powered scrubber unit, a bottle of oxygen 
(to make up for what you use) and a
few draeger tubes with you than building a 
Heath-Robinson rebreather device.


 

Good luck with the project, love to hear
more about it.
 

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