Unfortunately it is much more complex than that - there are fast loading tissues, slow loading tissues, and many other factors alone at scuba diving. At freediving there are even more variables with the very variable content of CO2, fast ascent velocity, and also the periferal vasoconstrciton and cerebral vasodilation are playing an important role. So as Eric wrote, he developed an algorithm for the Liquivision Xen computer, and will offer a simulator so that you can see how it works even without his computer. Just keep on mind that there is no warranty, and that there is very little research done - the algorithm Eric wrote is based on his knowledge and experience, but it is not peer reviewed and cannot be easily backed by a huge database of dives like it was the case at the validation of scuba deco algorithms.
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