Underwater, this rock plunges down both sharply and gradually. It is broken up with large ledges, some with sandy bottoms, and an outher pinnacle. The colorful, prolific fish life gives relief to the harsh contours of the reef. Sometimes the fish gather in such numbers that they momentarily blot out the sun. Whitetip reef sharks are present in quantity and some of the females have mating scars, inflicted by over-excited males during coupling. Encounters with bigeye jacks, tuna, and silky sharks can be expected. Hemmerhead sharks are reputed to school farther out, where the current is very strong, and extreme caution is recommended. Medical help can be found at hundreds of miles distance. In the northern section at 25m, there is a flat patch that lies at the entrance to a small busy tunnel. Approximately 6m high and 9m wide, this tunnel is so crammed with fish that it is quite easy to miss it altogether. The fish that congregate here -blue-striped snappers, squirrelfish, yellow goatfish- do so to escape the current and sharks. This is easily the liveliest section of the rock and, fortunately, is in shallow water. Swimming in and out of the tunnel can be wuite tricky. In the shallow waters around the rock, a heavy surge pushes and pulls floating opjects, rendering any powers of direction virtually useless. This dive is also known for the many cleaning stations and octopus. An excellent dive site when more interesting sites are inaccessible due to bad weather.