The wall is a large rock, which in ancient times was shaped like a wall thanks to stone tools. This wall was part of the defensive structures. And in the Middle Ages, when the sea level rose, it served as a breakwater. There are ruins of buildings all around it. Due to marine activity, they have eroded, but if you look closely you will find that they are structural elements. The depth is only 5 meters, but this favors diving for over 1 hour with a light 10 liter bottle. The marine life is diverse, a good idea is to peek under large rocks where you may see larger fish hidden.