From the shallow anchoring spot at 4 meters deep, we will only need a few fin strokes to reach an edge which drops almost vertically to 18 meters. These walls are natural basalt stone formations which look like they are man-made. The cooling effect of the water on the hot lava has caused the formation of small caves and tunnels. Here we can observe a huge group of yellowfin grunts, hunting barracudas, trumpet fish standing on the walls, and, for the trained eye, octopus or the occasional angel shark also.