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add a clothespin air pocket attention Blue Holes buddy's CAVE DIVING COMMUNICATIONS Cave Diving Section cave system cave-diving buddy cave-diving courses cave-diving training Cavern Diving Manual Chapter decompression depth gauge direction of travel directional decisions dive teams Dorff Markers emergency entanglements exit the cave exploration feet flashing Florida gap reel going H. V. Grey hand signals hand signs HV Gray identify indicate installed line intersection Joe Prosser jump reel l'm okay lead diver light signals line markers line-to-line loop mean National Speleological Society NSS Cave Diving NSS Cavern NSS-CDS open-water divers outbound side passageway permanent guideline permanent line plastic line arrows pressure primary light primary reel problem rear diver reels and line safety second team Sheck Exley side tunnel silting sinkhole slate Speleology Student Cave sump surface swap places Swim closer tank team members temporary line tion Touch-Contact turn the dive tying underwater caves underwater-cave communication usually