Quote: (Originally Posted by
graham_hk)

I think that it is the limit of the scrubber that Casey was talking about - rather than the limit of SCR. Compared to the bailout needed for extreme dives the drive gas is minimal (say 2-4 Al80s) thus CCR does not offer any real advantage (you'd need two stages anyway - dil and O2) and there is no CCR that can do 10h + or so on one fill.
CCR does offer some advantage for ocean bounces (maybe you can carry less stages)- but I'll stick to my RB80
Graham
you may want to go look at the expeditions done on the Cis-lunar Mk5, where bottom times were over 12 hours. the Meg with radial scrubber will do 10 hours in warm water.