nstructed The tunnels and stations were to be of the following as described above, but surrounded by a metallic frame- of 5 meters (16.4 feet) in such a manner that the cais- types: work which shall serve as the caisson, thus enabling son could be sunk upon a perfectly horizontal bed. On The… … The First Caisson Launched Sidewise. Construction of Iron Lining Tube. THE TUNNEL UNDER THE SEINE RIVER. the caisson are composed of sheets of iron attached to had been driven, against which the caisson rested. lined with metal. Each tunnel was to have an internal These piles formed the first part…
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