Not really. We plan to be able to finish a dive on OC (Open Circuit) just in case we have to bail out.
Quite the opposite. OC tends to slow breathe to conserve gas. We have to breathe a bit more aggressively to get rid of our CO2. CO2 retention is our biggest nemesis.
These are pretty common...
We metabolize O2. Our O2 sensors measure how much O2 is left in the system and injects that through a solenoid, or the diver does it. The rest of the gas is scrubbed with sof-no-lime to remove the CO2, and we breathe the recycled mixture. That's why we call it CC or Closed Circuit. The most we...
Never. Ever.
It's a balance. Showing an instructor's card usually affords you a bit of leeway at a resort or liveaboard. It also sends a message that you're ready to help out to a point. If you don't want that, then show a different card or bring a buddy, even two.
It really didn't happen. The hype about poor quality is nothing more than fear mongering. As I pointed out previously, it's like the "You're gonna die" mantra about split fins. Totally uncalled for.
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