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Kevin,

My point was that fully closed units can be made safe enough if given the
same restrictions as OC. But what dive operator in his right mind is going
to put a bunch of yahoos in the water with, by todays standards,  unlimited
air supplies and greatly increased no decompression limits?  Thus the drift
dive from hell!

How many divers do you know who don't understand the tables and have no
concept of how to dive alone? For that matter when diving with buddies, how
many wouldn't kill themselves trying to save a panicked diver having only
touched on the subject of underwater rescue in class.  For that matter,
according to what I have been reading, running out of air is a serious
threat!

Rebreather training would have to be more thorough than OC, but the
audience would gradually grow until the subjects you and I find so new and
"above" OC divers are commonly discussed.  Times change.  Hypoxia,
hyperoxia and hypercapnia are covered in advanced nitrox classes already.

Assuming they have all been taught correctly and can discuss technique
with the guy sitting next to them on the boat I can see a whole new
generation of divers coming along. I remember when scuba was in the same
state of unfamiliarity as the rebreathers are in today.  If rebreathers
were cheaper, "we wouldn't be so all alone".

So how do we know you didn't pee in your wetsuits?

Mike

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