Johnoly
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...as we got to diving the 165 foot stuff, and then the deeper stuff in the early nineties, that "fight" with the fish was becoming a problem,
I agree but from a different angle. At the 165 depths, that micro-bubble formation is incredibly fast even if you are relaxed & not spearing. But have a massive fight for 5 minutes and there is no computer program (not even DecoPlanner) that can accurately calculate the increase bubble formation because your work load just went 10 times up. If you are spearing at that depth, you most likely are on air cause Helium is too expensive and no fish is going to bring in that many dollars to pay for the gas. Not using a PPD at those depths is just too risky a chance for a chamber ride. In Jupiter, we lift our fish, let the captain deal with it and minimizes the shark issues.