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Ross, I already gave thought to the disruption of the traffic during a construction period, and considered it possible to do one carriage at a time, as each have two lanes, meaning that the traffic would be transitting on one half of Townwall Street in both directions, while the other half is being dug up and laid out as a cut and shut tunnel. It might cause as slight traffic conjestion, but nothing that would make circulation impossible, considering the limited length of Townwall Street.
The flyover at Eastern Docks could also be used to divert a part of the trafic until the construction owork were complete. I don't think it would take years for a double tunnel to be in place, after all it's not the Channel Tunnel we are talking of!
By the way, how was it possible to excavate the Channel Tunnel but then find it's too dificult to make a Townwall Street tunnel?
Once again, a drainage system would solve the underground water problem, and furthermore, the fact that it is a shingle and sand stretch and would have a cut and shut tunnel would make it so much easier to maintain for the simple reason that it would not be running under a cliff such as the rail link betwen Dover and Folkestone! So really, all the arguments presented mean it would be so much easier to do than if it were under a cliff.
Finally, somee tunnels under the Alps are many miles long, going through sheer stone, and yet they did it! I believe the more we progress here in Britain, the worse it gets. Before long, at this rate, people won't be doing anything anymore!
To me it looks as if many have already given up and surrendered!
