Main Street Tunnel 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 Welland Canal. It is named as a part of East Main Street. The structure was built as a part of the Welland By-Pass project. Its construction was relatively easy since, like the Townline Tunnel, it was constructed at the same time as the channel above it and a simple cut and cover. The tunnel was officially opened on May 20, 1972. The tunnel links Highway 406 on the west side of
Gotthard Road Tunnel north-south line in Switzerland. It was opened in 1882. In this category it is no longer the record-holder. The Seikan Tunnel in Japan and the Channel Tunnel between the United Kingdom and France are both in excess of . Under construction since 2002 and opened on 1 June 2016, the Gotthard Base Tunnel (a second rail tunnel, long), is the world's longest. It was built for the use of trains travelling from northern Switzerland to the Ticino area and beyond. The Gotthard Tunnel is the core and culminating point of the A2 motorway in Switzerland, running south from Basel through