At first, the work didn’t sound too difficult, particularly not for someone like Takoby Cofield. Here’s a young mountain of a man—six feet, four inches tall and 310 pounds of brute force—who plays offensive tackle for the Blue Devils football team. He’s accustomed to tossing around 300-pound defensive linemen every Saturday. How hard would it be to spend a few days in May digging a hole, especially when he had the help of nine of his fellow linemen?When that hole is in rural Ethiopia—and when that hole is dug with a manual percussion drill—the answer is, pretty tough.