Rock mass classification
Episodes
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#5779: Tunnel Girl Dug 80 Feet Under Her HouseNo engineering degree, two books, and ten dead jackhammers. How one woman dug an 80-foot tunnel under her Virginia house — and got it permitted. -
#5789: Build First, Ask Later: Hermits Who Dug CathedralsNo permits, no blueprints, no training. Two categories of builders who did the unreasonable — and what they share.