Quote Originally Posted by Nitrogenius  View Original Post
Well handling of unit in zero viz and cave environment comes to mind

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You don't know what you don't know comes to mind..

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Given all the above asking for a requirement of a CCR cave card does not seem to be that "odd".. especially from an owners perspective that might encounter liabilities with your diving..
Good post. I would add mixed team diving (CCR's with OC's) in regular and bailout scenarios, as well as emergency procedures in mixed scenarios (same cave, not same team).