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Ummm...I don't think this is accurate. A scuba cylinder is a non-flexible vessel...their air inside does not expand as you suggest. My understanding of the voodoo that goes on is that the difference between the pressure differential of the air in the tank compared to the ambient pressure becomes such that the regulator can not deliver air any longer. As the ambient pressure decreases as one rises in the water column the pressure differential changes which allows the regulator to once again deliver the limited amount of air that is left in the tank...until the tank pressure again drops to the point the regulator can no longer compensate for the current ambient pressure.
To the OP....congrats on not winning a Darwin award. Not sure who trained you or how you were trained...but it is evident that you either lack fundamental understanding necessary to dive safely or are willfully ignorant of the training you received...in either case you are in urgent need of re-training. Find a diving mentor to learn from because if you continue diving in the way you describe you are very likely to injure or kill yourself.
Good luck.
-Z
So I would suggest a bunch of shallower, solo dives while not carrying a speargun is definitely called for.
John, you’re a very articulate person and have some sound advice. Your suggestion to Matt that he continue to dive solo seems way out of kilter with everything else you wrote.
I think Matt should seek out a seasoned dive buddy to help him learn, through repeated dive planning, buddy team dives and post-dive debriefs, how to practically apply the standards he was taught in his BOW course.