This is a cave called Agia Sofia.
There was a large rock formation that jutted out into the water. I wanted to see what was around the other side at such an already beautiful deserted beach. An even more deserted, beautiful beach no doubt. I had to walk into knee deep water that was splashing so hard it was throwing me up against the rock next to me. I only had flip flops on that were slipping and breaking, so I took this picture and turned back. I'll have to bring water shoes next time.