"shafts can be drilled vertically to a depth of several kilometres—then made to turn sharply and continue horizontally for up to 12km (or 7 miles). Will Grace of Schlumberger, an oilfield services company, likens it to dropping a plumb-line from the top of the Empire State Building and then guiding it through the rear and front windscreens of every car parked in the nearby streets."

Drilling is thrilling, and getting more so.