re: ‘Holy grail of shipwrecks’: recovery of 18th-century Spanish ship could begin in April

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The Romans were well known as specialists in hydraulic mining. To expose and release gold deposits from the earth, they used hydraulic pressure. Miners would carve aqueducts into the rock, which were used to transport water from the nearby creeks and rivers. Then the flow of water would fill the excavated cavities, causing pressure streams strong enough to pierce and break up the thick rock walls.

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Anybody else who’s had fluid dynamics believing this? How many feet of head pressure does it take to break stone?