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This 11 meter high gallery was reinforced using a
layer of sprayed liquid concrete to prevent the ground above from continuing
to fall into the quarry. The concrete was then further strengthened with a
masonry arch. Nowadays, the Inspector General of Quarries reinforces
dangerous areas with injections of liquid cement, a procedure that can be
carried out from the surface. In order to prevent serious accidents, the
Inspector General of Quarries restricts building permits in areas located
above ancient quarries.
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Go back to the bones of 1792.
Examine the map.
Enter the Cloche de Fontis.
