You might wish to take a look at some of the mortality related data at rebreatherworld and the cdc does quite a bit of reporting on mortality. An instructive comparison for cave diving might well be climbing and it is useful to look at what public agencies (nps) require for climbing places like hood or ranier. Bill
"With regard to cave diving, the great thing is to be carried where you could not have imagined you would ever be, and then to come back alive."
"Wilderness. The word itself is music." Abbey, Desert Solitaire
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