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The Seegrotte underground lake is located in Lower Austria in the city of Hinterbruhl. It was formed as a result of natural changes that began from the moment when blasting operations were carried out in one of the mines in Lower Austria in 1912. As a result, underground waters came out and filled the adits and passages, thus, a lake was created underground. Accordingly, all work on the mine was stopped.
In the 1930s, a group of speleologists rediscovered the lake. It turned out that the underwater world has become very diverse and impressive, and it was decided to open it to visitors. So for tourists, the underground lake has been opened since 1932.
During the war, the underground lake, along with the adjacent territories, was occupied by the German Wehrmacht. Water was pumped out of the cave, the premises were dried and an aircraft factory was created. Only after the end of the war, the plant was destroyed, and the cave was again filled with water. But only three years after the end of the war, tourists began to be allowed to the underground lake.
You can get to the lake by going through a rather narrow and low adit, the length of which is about 400 meters. At the end of it is the so-called"rest room". Behind the room there is a small lake called"Blue". Its depth is three meters and the area is 300 square meters. Further, after the small lake, there is the chapel and adit of St. Barbara. And finally, going down the stairs, you will find yourself on the shores of a large underground lake. Its area is over 6,000 square meters. Water into a large lake comes from seven springs, but there is no outflow. All excess water is pumped out at night by pumps.
Visitors to the underground lake have the opportunity to take a boat trip and admire the amazing underwater world.
The Seegrotte underground lake is considered the largest underground lake in Europe.
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Topic: Seegrotte underground lake in Hinterbruhl in Austria.