Spéléodrome de Nancy, Underground training center in Villers-lès-Nancy, France.
The Spéléodrome de Nancy is an underground caving training center built inside a network of limestone galleries beneath Villers-lès-Nancy. The passages were originally dug as part of a water supply system and later adapted for caving practice.
The gallery system was built in the late 19th and early 20th century to supply water to the city of Nancy. Decades later, cavers discovered the network and turned it into a training ground for the sport.
Cavers use this network regularly for training sessions and to introduce groups to underground environments. Visitors get a direct sense of how people move and navigate through narrow, dark passages beneath the surface.
Access to the galleries requires descending a vertical shaft, so sturdy footwear and warm, waterproof clothing are needed. Visits always take place with trained guides who provide the necessary equipment.
The floor of some passages is covered with tiny limestone spheres formed by the slow dissolution and redeposition of calcium carbonate. These rare formations, sometimes called cave pearls, draw particular interest from geologists who study underground environments.
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