"Located above Les Mosses, Lac Lioson is a pearl among the lakes of the Alps. Covered with ice and snow in the winter, it appears to be sleeping, but a natural spectacle is unfolding underneath its blanket of ice. Accompanied and instructed by experienced divers, guests can dive underneath the ice. The water is clear, allowing divers to observe a magical light play in this enchanted, icy world, guided by an Ariadne’s thread. There are bubbles formed by the ice, and you will even see a few fish swimming in the lake under the ice.