They were in the middle of ten thousand acres of nothingness, and the only man-made structure their side of any horizon was the railroad track to the east, but midnight was five hours after the evening train and seven hours before the morning train.
Therefore, no prying eyes. Their backhoe had four spotlights on a bar above the cab, the same way kids pimped their pick-up trucks, and together the four beams made a wide pool of halogen brightness. Therefore, visibility was not a problem either. They started the hole in the hog pen, which was a permanent disturbance all by itself. Each hog weighed two hundred pounds, and each hog had four feet. The dirt was always chewed up. Nothing to see from the air, not even with a thermal camera.
The picture would white out instantly, from the steaming animals themselves, and their steaming piles and pools of waste