Unresponsive diver from the bottom is in no way an advanced skill. It is and has been part of thousands of basic open water classes for over fifty years. Only those classes that were broken up for no other reason than to.get into divers wallets consider it an advanced skill. Same with buoyancy and trim. Basic open water skills. If a diver doesn't have them somewhat under control they should not have been given a card. Again another result of greed over all.
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