In the wood between Zbrosławice and Tarnowskie Góry underground waters flow from the tunnel "Frederick" into the so-called distribution station "Frederick", which conveys it, and after a few hundred meters, into the Drama River. The outflow of groundwaters was covered with an interesting brick structure the so-called "Miners Gate " in the early nineteenth century, Part of the "Frederick" is called the "Black Trout Adit", located in the park sanatorium in Repty Śląskie. It is open to the tourists who go in metal boats along a 600-meter stretch of the underground, between the shafts "Eve" and "New Year’s Eve".