What is the proper procedure for what I guess I would call "under water CPR" while you make your safety stops.
There isn't such a procedure. No such thing as "CPR" underwater. The likelihood of survival after cardio-pulmonary arrest at depth is close to zero. Even on dry land, with an immediate call to 911, the survival rate for cardiac arrest is less than 5%.
If there is a deco obligation, the likelihood of survival is zero, unless the team is willing to skip deco and get the victim to the surface. Even then, the likelihood of survival increases from "zero" to "abysmal." And the team's risks of complications (such as DCI) increases from "small" to "almost certain."
Is it worthwhile risking everyone's life to save someone who will almost certainly not survive? That's a question that each team must discuss ahead of time.
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