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Show World's Most Famous Tunnels. If the new tunnel through Mont Blanc is cut, as anticipated, within five years, the work will compare favorably fa-vorably in expedition with some other great undertakings of the kind. The Mersey tunnel, though but a mile and a half long, took six years to cut; the Severn, four and a third' miles long, took thirteen years; the Mont Cenls, eight miles, took fourteen years; the St. Uothard, nine and a third miles, ten years; and the Sim-plon, Sim-plon, twelve and a quarter miles, eight years. |