Why not run your wing from offboard? My BOV and wing run from the manifold with a QD to my offboard. It uses a minimal amount of gas when you get used to balancing it with your suit.

I calculate bailout on fill pressure -30bar so I've got a lot of padding in there. OK bailout is another thing to monitor but I like my dil just to feed the the loop and that's it.


I don't have a gauge on my O2. Any hint of a problem and it's home time. If there's no problem then the O2 will last longer than I want to be in the water (or my scrubber).


So bailout plus 0.75l bottle plus suit bottle plus onboard plus Rebreather... Wouldn't OC be a hell of a lot simpler? As I've said before, my two tests are: if OC means less cylinders and/or OC is cheaper then I go OC for cave diving.


That's "roughly" how I plan mine. Only I take an extra of whatever my deepest bottle is. So if I need 1x12 to exit then I take two. If I need two then I take three. I have serious doubts over the survivability of a CO2 hit in a cave. I also tow a scooter if I'm 30m+ with any distance so perhaps I'm just paranoid.

For turnpoint I go for 1/3 off dil (I don't put a gauge on my O2) unless I've hit a predetermined point (if it's a cave I know) or time (if it's a cave I don't). Even if I've got plenty of dil/bailout/whatever, I turn if I hit that point. I find cave diving CCR a lot more restrictive than OC, if I want to just get in and swim and have a mooch then I far prefer OC.