knotical, I think there is some truth to that. Certainly, at the final check during our rundown in the water, I didn't look at my gauge because I "knew" I had already done it.
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
I can answer that (somewhat). Through the process of elimination, by the fact that she had been breathing it (and staying alive) for at least 15 minutes, she knew there was SOME O2 in it -- thus the only remaining question was -- 100% or something else? Since she knew who had had it filled, she knew he was too cheap to fill a 130 with 100% -- thus the next worst mix would have been 50% -- and she was above the MOD for 50%. Problem solved (sort of!).Once I had gotten over the "oh sh!t" moment of why I only had 1500 psi, my next concern would be "what the he!! is the mix really?"....
I can answer that (somewhat). Through the process of elimination, by the fact that she had been breathing it (and staying alive) for at least 15 minutes, she knew there was SOME O2 in it -- thus the only remaining question was -- 100% or something else? Since she knew who had had it filled, she knew he was too cheap to fill a 130 with 100% -- thus the next worst mix would have been 50% -- and she was above the MOD for 50%. Problem solved (sort of!).
And this one time, there was a teensy, tiny air leak in the inflator hose connection that I could not hear over the engine. And 45 minutes later, once we were anchored, geared up, and ready to jump in, I had only half a tank of air left. It wasn't life threatening, but we only did one dive that day.
A half of a tank in 45 minutes is not a small leak but the engine or many other things could conceal the noise. I always turn my tank off after checking it as a means of detecting any leaks.