The Aldinga drop off is on the edge of the Aldinga reef. The reef drops away from 5m to 21m creating a spectacular dive that is a mass of caverns, crevasses and overhangs. The reef is inside an aquatic reserve and fish abound making this a photographers paradise. The drop off is where the big schools of snapper stay when travelling north to their breeding grounds. When the snapper are running it is advisable not to dive this area as the snapper school is occasionally followed by white pointer sharks.