Mühlbachquellhöhle, River cave entrance in Dietfurt an der Altmühl, Germany.
Mühlbachquellhöhle is a cave system with underground water channels beneath Dietfurt an der Altmühl. The network extends for many kilometers below ground and contains numerous passages where water flows through.
Initial exploration of the cave began in the 1930s, but researchers did not reach the main chambers and water passages until 2001. This discovery revealed that an entire underground world of limestone and flowing water exists beneath the region.
The site attracts researchers who study underground water systems and how limestone dissolves over time. Their work here helps explain how groundwater flows through rock and shapes the landscape beneath the surface.
A marked trail on the surface guides visitors around the cave entrance and surrounding area. Those wanting to explore deeper passages must obtain special permits and bring proper equipment.
Astronauts have used this location to train underground and practice skills in complete darkness. The subterranean environment provides conditions that resemble aspects of working in space.
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