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
Channel Tunnel over its predicted budget. Since its construction, the tunnel has faced a few mechanical problems. Both fires and cold weather have temporarily disrupted its operation. People have attempted to use the tunnel to enter the UK illegally since 1997, creating the ongoing issue of the migrants around Calais on the French side, causing both diplomatic disagreement and violence. In 1802, Albert Mathieu-Favier, a French mining engineer, put forward a proposal to tunnel under the English Channel, with illumination from oil lamps, horse-drawn coaches, and an artificial island positioned mid-Channel for changing horses. Mathieu-Favier's design envisaged a bored two-level tunnel with