Stock Photo - 08 August 2019, Jachymov: Kilometre-long tunnels connect the underground sources of radon-containing water in the mine Unity in the Czech spa and mining town. The mine is normally not accessible to visitors. First silver was mined here, then uranium. Today, radioactive water is extracted here for spa operation. The Montan region Erzgebirge has been recognised as part of the world cultural heritage since July 2019. (to dpa KORR) Photo: Michael Heitmann/dpa. - Jachymov/Germany

Stock Photo: 08 August 2019, Jachymov: Kilometre-long tunnels connect the underground sources of radon-containing water in the mine Unity in the Czech spa and mining town.

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