I had always remembered my first non-training dive lasted for a duration of 35 minutes and the second dive was 40 minutes. I was told during the course to breathe normally, I soon learned that was bad advice and I learned to skip breathe to increase my time under water.
Fortunately I was talked into undertaking an Advanced Open Water course directly after my entry-level course, I told my instructor I wanted to go out and gain some experience before undertaking a series of courses.
I am glad I did as I had plenty to learn and I am a believer in experimental learning methodologies. I learned ascent rates, buoyancy control, dive computer use and finally stopped my carbon dioxide headaches after learning improved breathing techniques from fellow divers.
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