Sataya South (Dolphin Reef) is well known for the large population of Dolphins that live in the lagoon. Diving is only really done on the south western end of the reef. A number of deep and long drift dives are possible plus a bit of searching around the anchor area.
The boats usually anchor up on one of the series of ergs extending from the most southern point towards the east. The prevailing current from the north pushes against the reef and a white line of crashing waves against the reef outline the large size of this reef - which measures over 500m north to south here.
In terms of diving, there are relly three options here - a shallow dive between the ergs near the anchoring area and spending a lot of time looking for small creatures hiding in the coral walls. The second option, a the most dived option, is to be dropped on the most western point and drifting slowly back to the boats following the reef wall. At the western point, a negative entry is adviseable and then pick your depth to follow the reef back. Also check here for some larger fishes that seem to congregate around the western point.
The third option is the most challenging dive and will require both RIB exit and entry. You will be dropped on the northern edge, with the current pushing the RIB onto the reef. A negative entry is a must, to ensure that you don't get pushed onto the reef itself. You can drop easily to 40m here and enjoy the current bringing you back to the west. As you move along, slowly loose depth along the way, so that you are at 15m to 20m after having travelled for 400m to 500m. At this point, you must swim away from the reef and deploy your SMB, do you safety stop in the shallow 6m and let the current carry you towards the south. You have really good chance of seeing some larger fishes swimming past as you do your stop.