Straight down to 22m to look over edge of outer reef. Less current than previous dives here, but still significant with some vertical. Sighted a couple of white tips, but other divers over the reef edge seemed to send them away. Saw some jacks. Waited a few moments to see if the white tips would come back, then dropped over reef edge and drifted right shoulder. Large overhang at 30m. Big tuna. Large turtle swam close underneath me. Strong current as we were swept around the edge of the reef and lost sight of Bob for a few moments. Ended the dive drifting over dead coral with not much fish life.