Descended a gently, sandy slope, which steepened until sand was running down it like a waterfall. We followed the sand falls down to about 90 feet, where the grade disappeared into a the vertical wall of a 3,000 ft canyon. pretty cool to swim out and hover over the abyss watching the the sand falls tumble into it. then we slowly ascended in a zig-zag pattern along a rocky wall between sections of sand falls. saw a bullseye stingray, a big seahorse (at least 6"), moray eel, and a flounder. very good dive.