Quote: (Originally Posted by PeteS)
When an OC trimix diver crosses over to CC (as they all must - the pull of the silent side is strong) what level are they certified to? Back on air, or are they certified to use trimix as though they are OC?
As far as the agency is concerned, back to air diluent and air depth limit.
I think the "justifications" for the additional training are (right or wrong is up to your opinion):
- different bail-out procedure for CC Trimix (against OC Trimix)
- multiple bail-out procedures available on CC
- different gas volume computation due to limited number of stages
- buoyancy issues with additional source (i.e. loop volume)
I am sure there are more, but those are the first ones popped in my mind...