Quote: (Originally Posted by
dave t)

...As for the "getting a co2 hit to see what its like" you might want to try putting gun to your head and pulling the trigger to see if it will hurt...
Having done it personally as part of the original Rebreather course on the PVR-BASC in 1998, I recommend NOT to do it. It wasn't fun...
And it was done in a controlled environment as in on the side of the shallow end of the pool with 2 supporting divers on either side. I still would not have made it on my own.