Black Trout Adit, Underground water drainage tunnel in Tarnowskie Góry, Poland.
The Black Trout Adit is an underground water drainage tunnel near Tarnowskie Góry that extends some 600 meters beneath the surface. The tunnel has two entry points called the Ewa and Sylwester shafts, and visitors navigate it by boat.
The adit was built in the late 1700s as a drainage system for the Friedrich Mine, one of the region's major mining operations. The system helped remove water from the silver mines so miners could dig deeper and extract more ore.
The passage represents the ingenuity of miners and engineers who solved water problems deep underground. It shows how people adapted their skills to work in these difficult conditions and maintain the mines.
Visitors explore the tunnel best by guided boat tour, which takes about an hour and travels between the two shafts. Wear comfortable clothing since the area can be damp and slippery, especially near the water flow.
The name comes from dark trout that once swam into the water system from a nearby river. These fish were an unusual side effect of the drainage system and inspired the tunnel's distinctive name.
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