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An underground via ferrata
In Tellure is the first underground via ferrata in the world. The large column (an underground cavity) which stretches almost 120 m (393 ft) high has been specially fitted out and made safe for the practice of via ferrata. The Saint-Jean Engelsbourg silver mine known as "La Colonne Saint-Jean" is the largest man-made underground cavity in the Vosges Mountains, a particularly breathtaking cavity (180 cubic meters).
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