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IMHO, rebreather diving requires far more skills than recreational diving. It starts with the pre-dive preperations, the constant diligence during the dive and the fact that far more can go wrong on a rebreather dive. My initial training consisted of a small part on how to assemble and maintain the unit and hours under water with safety drills for all possible failures. Hyperkapnia, hypoxia and hyperoxia are constant threats, and manually flying the thing or bailing out is something that I think is beyond the realm of most recreational divers. I'm aware that some companies are marketing their units as recreational, and now that PADI is getting into the game it will become quite interesting. Maybe one day rebreather diving will move into the world of recreational diving, just as nitrox did, but with most of todays units, I would consider it technical diving at its finest.
I would say, rather, that it requires a different set of skills that do not apply to open circuit diving. But they're not rocket surgery, and a recreational diver could easily learn them and apply them with a moderate amount of diligence.
About the most difficult adaptation, I would think, would be relearning buoyancy control. And on the units I tried during the workshop even that didn't appear to be anything terribly difficult to adapt to.
But I would not consider a relatively shallow, no-deco dive in a lake to be "technical diving at its finest" ... in fact, it wouldn't appeal to me at all ... not even on the world's finest rebreather.
Now you take that 'breather up to north Vancouver Island and go gorgonian-hunting on a 200-foot wall dive and you're onto something ...
... Bob (Grateful Diver)