This category leads to websites about the engineering project and continued technological developments and environmental consequences of construction of the tunnel under the English Channel, between Folkestone and Calais.
For websites promoting engineering companies please follow links in  UK Industries: Engineering, otherwise please see the appropriate  Locality

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The Williamson Tunnels are a network of tunnels under the Edge Hill district of Liverpool. They were built under the direction of Joseph Williamson in the early nineteenth century.