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Tunneling is the process of creating underground passages or tunnels, often for transportation, water supply, sewage systems, or mining purposes. It involves excavation through soil, rock, or mixed ground conditions using various methods such as drilling, blasting, or tunnel boring machines. Tunneling is a complex construction activity that requires ___ ________ __________ ________ ______ _____ ______ __________ ____ _______ __________ _____.
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