I wouldn't have thought myself that anybody would know that there was a spring deep in the heart of a mountain, any more than I can tell you there is one under our feet where we are now. If you are asking me did any of my people on the spot know that there was this spring water, then the answer is, No—they couldn't possibly. ... It was impossible to know that there was a spring in the heart of this tip which was turning the centre of the mountain into sludge.