A nice place, we were gone for the day from Koh Ngay, we made several spots of snorkeling each as nice as the others. The cellars are swimming, we took the life jackets but without putting them on it is more convenient. We are entering a tunnel in the dark. After a few minutes we arrive on a small beach in the center of the earth. We are in a circus surrounded by high vertical cliffs. The vegetation is abundant, it is a place apart. For the return when we arrive at the exit of this tunnel, we understand why the cellar of emerald, the light of the day and the sun gives this beautiful color to the water.