I agree. Keeping a 1.4 km long chain of elevators with buckets of sand running, with as little friction as possible, in a hard to access mineshaft, probably wit

I agree. Keeping a 1.4 km long chain of elevators with buckets of sand running, with as little friction as possible, in a hard to access mineshaft, probably with high humidity, and sand everywhere, sounds like a very expensive operation.