Main Street Tunnel technique, whereby the tunnel was excavated, the concrete poured, and the structure buried, on top of which the canal channel was built. This avoided costly boring beneath an active waterway; the structure cost C$11 million. This price was split 50–50 between Transport Canada and the St. Lawrence Seaway Authority. The tunnel opened with a parade featuring the Welland Police pipe band and various officials on the morning of May 20, 1972. Main Street Tunnel The Main Street Tunnel, located in Welland, Ontario, Canada, is an underwater tunnel, carrying Niagara Road 27 and the unsigned designation of Highway 7146 under the
1996 Channel Tunnel fire run trains on fire through the tunnel to one of stopping the train and evacuating the passengers as soon as possible. The Channel Tunnel is a long undersea railway tunnel linking Folkestone in the United Kingdom with Coquelles near Calais in northern France. A diameter service tunnel is positioned between two diameter running tunnels each with standard gauge rail track with an overhead line energised at 25 kV 50 Hz. There are connecting passages from the running tunnels to the service tunnel every and piston relief ducts connect the running tunnels managing the pressure changes due to the movement of