When I was learning to Scuba, there was a skill practice that still fascinates me.
When you go into the water and put the regulator in your mouth to breathe from the tank, the common assumption is that the regulator will stay in your mouth and you will breathe unimpeded and without concern for the trip.
That is not the reality. The regulator comes out, likely when you don't expect it. So you practice taking it out, using your back up, maybe use your partners backup, maybe share their primary. That brief moment of trust when the regulator comes out, that feeling as air rushed in. To be calm -with or without air- that is my focus today.
Dieter Wentzel, CPHR