Japan–Korea Undersea Tunnel at about ₩100 trillion (approx. US$90 billion), which would produce an extremely low benefit-to-cost result. In 2014, the South Korean Busan Development Institute estimated the undersea tunnel could create ₩54 trillion won (원54T, or US$53 billion) in economic benefits and provide about 45,000 jobs. In an April 2009 editorial, former Justice Ministers Daizō Nozawa of Japan and Kim Ki Chun of South Korea remarked on some of the similarities of the proposed Japan–Korea tunnel to the world's present longest undersea tunnel. The Channel Tunnel runs for 50.45 km linking the United Kingdom and France, and opened in May 1994: At
Alderton Tunnel line, the route through the tunnel closed from 19 August to 15 September 2017 to allow overhead electrification equipment to be fitted. Alderton Tunnel The Alderton Tunnel sits on the South Wales Main Line in England, on a stretch of line between Swindon and Bristol Parkway. The tunnel, which is 506 yards long, was opened on 1 January 1903 along with the line between and , that being the first section of the South Wales & Bristol Direct Line of the Great Western Railway. Building of the tunnel commenced at least two years before 1903, as the rise in railway