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How deep a hole could I theoretically dig in my backyard? It would have to be at least six feet across, straight down for my purposes. And 15 feet deep at the very least, the more the better. My neighborhood was once heavily mined so I know the bedrock is chossy and diggable; I could even get one of those little Bosch hammer drills to bust through the flakes. Not sure what I'd do with all the dirt though.
