It depends i suppose what you'r going to do with it. I can remember diving OC 50/60mt. in air, it was normal!
But now we all know that it is much safer to wack some helium in your mix, than not.
What i'm trying to say is 'maybe' if an individual would be diving to the max 50mt. with an air dill, it might not be so wrong to let them 'wack' some helium into their dill!
We musn't forget that many people who pass to CCR have allready extended expierience on OC, including T/Mix, and gas planning, and management skills don't change that much between OC and CC.
That said, i wouldn't recomend anyone to venture into territory which would 'require' a significant %helium mix after just 3 weeks!
