Grüner See (Green Lake) is a lake in Styria, Austria, surrounded by the Hochschwab mountains and forests. Its beautiful emerald-green water mainly comes from the snow-melt from the karst mountains, which makes its depth fluctuates throughout the year. In winter time, the lake is only 1-2 deep and the surrounding area is used as a county park. However, when temperature rises and the snow melts, its water grows and reach its fullest depth of around 12 m from mid-May to June. At that time, its surrounding park is completely submerged in it and make the place heaven for diver. Bridge, bench, lane, how amazing it is to explore a park underwater! It must be really spectacular experience. Let’s take some enchanting images by photographer and diving enthusiast Marc Henauer who wants to share his firsthand divers journeying through the underwater park.