yo

Particular to mCCR I had an incident a couple of month ago that had a ccr cave diver student in a high stress and work load situation on a mCCR doing a zero viz exit out of a cave ... and it could have been out of a wreck too .... and had me on my toes.

While doing a high stress, high work load, high breathing zero viz exit out of a cave a mCCR diver exeeded his active O2 injection rate of his mCCR. While I was told by the diver upon inquiry how he is going to deal with the situation ahead of time and prior to the dive I was told he is gonna count to 120 and then inject some O2.

In the heat of battle so to speak I had to abort the drill as I realized the diver was at at a normoxic Po2 level and was about to exit the cave in the final stage, means coming up shallow and going back to the entrance - surface.

I amin my opinion confident that the diver would have suffered a hypoxic event even when only coming from about 40 feet - 12 meters ... but again he was at .21 when at depth.

My point here is not so much to point fingers or make a big fuzz, it just got me thinking about mCCR in zero viz situations, especially when under high stress and work load.

Just wanted to let the forum know about this potential issue that was prevented and how to overcome it in future procedure.

greetings
Matt