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Workers in China's Sichuan Province are using drones to help build massive new bridges across raging rivers! (Just look at the pictures in the linked article..truly stunning!) Drones are used to run a pilot cable across the expanse the bridge will traverse. With the pilot cable, larger and large cables can be added creating the framework for the bridges. The Chinese engineers are using a large 6-rotor drone to carry the pilot cable to the other side of the bridge structure. The engineers claim this method is over 100 times more efficient and 80% less costly than traditional methods!