Remote Controlled Excavation

In Canada, a man has been excavating his basement. This much is not news. The surprising part is his choice of tools: Remote controlled cars. Every Sunday, he sends down the remote controlled toys, sends them to part of the basement, has them dig, dig, put the dirt into a rock-crushing like machine, in miniature, of course, and haul the dirt to a centralized location for later hauling away. There are two reasons for doing it this way. One, he's a remote-control hobbyist, and has a lot of remote controlled things on hand. Two, the area is not conducive to humans most of the time, reaching temperatures as low as -30C every winter. This system of his gives him an ever-enlarging basement that can be used for storage in his business, all without leaving the heated, comfortable part of his house. Of course, the mad engineering way to do this would be to also automate the direction of the machines, which would then perpetually enlarge the basement according to a central computer's plans. The initial setup would be very very difficult, but thereafter, your basement would slowly grow (downward) with time. Humans might need to occasionally build a floor, stairs, and a ramp for the RC vehicles.