Réseau du Rupt-du-Puits, Underground cave system in Beurey-sur-Saulx, France
The Réseau du Rupt-du-Puits is an underground cave system that stretches through more than 17 kilometers of natural passages. It features underground rivers, dramatic rock formations, and connects to other cave systems beneath the surface.
The system was first discovered in November 1971 when speleologists completed a challenging 400-meter dive through water-filled passages. This discovery revealed one of the largest underground networks in the Paris Basin.
The cave network draws researchers and speleologists who study the underground ecosystems and rock formations. Visitors can observe how water moves through the passages and witness the organisms adapted to life in darkness.
Access requires obtaining a key through agreements with local speleology groups and the National Forest Office. Visitors should contact these organizations in advance to arrange entry.
A main siphon within the network ranks among the longest in France and connects underwater to the Grotte de la Béva. This underground link demonstrates how far the hidden passages extend beneath this region.
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