He could hear a drone coming up the valley, following the road. He could tell from the tone of its rotors that it was a big boy—the kind they used to deliver sacks of groceries. Rufus got to his feet, cupped his hands around his mouth, and hollered up to the peak that loomed over the mine entrance. "Drone coming!" he shouted. "We got any birds in the air?" Eagles—especially when they were wearing 3D printed gauntlets—could take down smaller surveillance drones with impunity, but the rotors on cargo carriers were beefy enough to cause injury. Carmelita hollered down with the information that all birds were safely in their boxes.