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Very interesting point. As it seems we have all at least heard stories of instructor injuries, it is strange that there has apparently been no lawsuits.I can’t believe that instructors are still required to teach CESA in a manner endangering their own health. When an orca was chewing up trainers it was covered up a while, but eventually resulted in an OSHA lawsuit, a movie, and awareness of the plight of workers and orcas. Are agencies not opening themselves to a class action lawsuit here?
Something else I was considering was a thread a while ago asking how "safe" it was to do multiple regular (non-CESA) ascents from shallow (20-30') depths on the same dive. Sometimes I do this--maybe up to 3-4 times, as I do tend to get turned around a bit hunting shells (even though I know the sites very well). I wonder if there is any difference with multiple CESAs vs. multiple normal ascents regarding DCS, ear problems, etc. I have never had a problem doing such normal ascents, but perhaps lucky.