We leveled off at 25m and the visibility was perfect. I could see my two buddies to my left—Kate adjusting her housing strobes and Dominic turning on his GoPro action camera. A group of silvertip sharks were casually circling a cleaning station, this one manned by bright yellow angelfish. They gave us a glance, but mostly, they were unconcerned. A few whitetip sharks emerged from the drop-off below to join us. More sharks—my favorite.