Good article, the rebreather sounds terrifying- twin 12s!
I gave up OC to save my back, just the thought of this makes it hurt.
BTW, I thought that the RB80 had a passive addition, with a one-way valve in the bellows to dump a fraction of the loop gas every breath, giving you some fresh gas each cyle- ala the Swiss EDO-4
What if this valve fails closed, are you not rebreathing the same gas, thus rebreathing the loop more than you are supposed to (and dropping the ppO2)?
Is this not a serious failure point?
Just wondering...
