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Ed, well, I agree with the idea that the Moats are not nice, nor was I really trying to suggest lengthening them. The topic is, if people could get massive projects done then on that scale, how come we can't get a tunnel under Townwall and Snargate Streets now?
Tony, in modern tunnel technology, digging is not so common as using machinery that does most of the hard work!
Paul, couldn'g grasp the meaning, what is a water-table? Are you referring to the level of water under the ground's surface? If so, a good point, but I think it wouldn't be a problem technically.