2airishuman
Contributor
For the record, when I first learned how to dive I received no card. It was a Master Cheif in the Navy and he never got in the water with us. He told us what to do and we did it. We never did a CESA, but when I ran out of air, I swam like heck for the surface. Usually, that was due to the K valve lever being knocked down. It was intuitive and I learned to check that stupid valve a few times before I splashed.
You mean a J valve lever? K valves don't have levers...