Ruina montium (Latin, "wrecking of mountains") was an ancient Romanmining technique described by Pliny the Elder (Natural History 33.21), who served as procurator in Spain.[1][2] It is thought to draw on the principle of Pascal's barrel.[3] Miners would excavate narrow cavities down into a mountain, whereby filling the cavities with water would cause pressures large enough to fragment thick rock walls.[4][5][6]
^Pliny the Elder (1857) with John Bostock and H.T. Riley, trans., The Natural History of Pliny (London, England: Henry G. Bohn), vol. 6, Book 33, Ch. 21, pp. 101–104.