Black Trout Adit, Underground water drainage tunnel in Tarnowskie Góry, Poland.
The Black Trout Adit is an underground drainage tunnel near Tarnowskie Góry, in southern Poland, carved through solid rock. It connects two shafts named Ewa and Sylwester, and visitors travel its length by boat.
The tunnel was built in the late 18th century to drain water from the Friedrich Mine, one of the main silver mining operations in the region. Removing that water allowed miners to dig to greater depths and reach new ore deposits.
The name Black Trout Adit refers to the dark-colored trout that were once spotted inside the water system, having entered from a nearby river. Today, visitors travel through the tunnel by boat and can see the original stone walls carved directly into the rock.
The tunnel is visited by guided boat tour, departing from one of the two shaft entrances. Bring a warm layer, as the interior stays cool and damp regardless of the season outside.
The tunnel is part of a UNESCO World Heritage Site recognized in 2017, which covers the broader network of mining works around Tarnowskie Góry. This makes it one of the few underground water management systems in the world to hold that designation.
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