Wassermannsloch, Karst spring cave in Eisenerz, Austria
Wassermannsloch is a karst spring cave near Eisenerz that extends over 1000 meters behind an underground siphon. The cave is one of Austria's longest water-filled systems with multiple underwater passages.
The first documented exploration took place in 1747 when Joseph Anton Nagel investigated the cave on behalf of the Austrian Emperor. Since 1995, underwater passages have been explored and mapped using modern equipment.
The name refers to an old legend about a water spirit who once guided people to discover iron deposits in the area. The tale connects this place to the region's long mining heritage.
The cave is only accessible with specialized equipment and professional guidance, as the underground waters are deep and challenging. Visitors should inquire beforehand since only organized tours with experienced guides are available.
The system discharges between 50 and 10000 liters of water per second, making it the main water source for the entire southwestern region. This enormous flow varies greatly depending on weather and rainfall, turning the cave into an important geological indicator.
Location: Eisenerz
GPS coordinates: 47.58190,14.82670
Latest update: December 12, 2025 14:20
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