Sorry, since you quoted my line about the topography, I thought that's what you were asking about. The pipeline is formed by drilling long holes (using bentoni

Sorry, since you quoted my line about the topography, I thought that's what you were asking about. The pipeline is formed by drilling long holes (using bentonite slurry to keep the hole from collapsing on itself), building a long pipeline use threaded or welded segments, and slipping the pipe down the whole. It's like well digging, but on a much larger scale.