Stock Photo - 11 August 2023, Saxony, Freiberg: Michael Kretschmer (CDU, M), Minister President of Saxony, stands in the Rothschönberg adit during his visit to the Drei-Brüder-Schacht in Freiberg. The Drei-Brüder-Schacht development association wants to generate electricity from hydropower in the old mine again in the future. The model is the so-called cavern power plant, which was shut down in 1972. The plant is now a technical monument and is part of the Unesco World Heritage Site Montanregion Erzgebirge/Kru·noho·í. The Three Brothers Shaft was created at the end of the 18th century and used for decades to extract silver ore. With the end of mining, new possibilities of use were sought, and in the process the idea of the hydroelectric power plant was developed. For this purpose, water was dammed underground and four turbines were installed at a depth of 272 meters, which supplied electricity from Christmas 1914. The plant is unique in its kind in Europe. Photo: Hendrik Schmidt/dpa. - Freiberg/Saxony/Germany