About Seegrotte Hinterbrühl

The Seegrotte at Hinterbrühl is a former mine located in lower Austria. the mine is the largest underground lake in Europe, covering 6200m2 the lake is artificially kept at a level of 1.2 meters deep due to the fact there is not natural drainage coming from the mine. The mine has been used as a war factory for Nazi Germany during the end of the second world war. nowadays the mine is used as a tourist site. 250.000 visitors visit the mine each year where you can get a tour on a small boat. The temperature in the mine is a constant 9 degrees Celsius so if you are visiting in the summer make sure to take some warm clothes.