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The Šance mountain (originally Turecký vrch or Türckner Berg ‒ “Turkish hill”) is another historically significant feature of the Jáchymov silver district. Extraction commenced here as soon as Jáchymov was founded, resulting in the many old sinkholes and collapsed adits that can still be seen today. At the same time, this area provides an illuminating insight into how the mines were supplied with water from the 16th century onwards. The Gegenbau adit (whose mouth is on the eastern slopes of the mountain) and the Dürrenschönberger adit (which opens to the west below the Jáchymov town reservoir) cut through the entire mountain. They served as leats, carrying water through the irrigation channel from the Neklid or Unruh adit below Boží Dar into the chamber of the Einigkeit mine. The total length of the watercourse, including its underground sections, was over 4 kilometres. The Gegenbau and Dürrenschönberger adits are still used for water management purposes today.