The longest tunnels have been constructed for water distribution, followed by tunnels for railways. Hydroelectric. Excludes potential extension from Punggol to Seletar Airport under planning, extension to Tanah Merah expected beyond 2030, List of longest railway tunnels in the world, Guangzhou-Shenzhen-Hong Kong Express Rail Link Hong Kong Section, Seoul Metropolitan Rapid Transit Corporation, List of metro systems § Metro systems under construction, J. Chokka Rao Devadula lift irrigation sceheme, "Korea completes record setting rail excavation", "Suseo High Speed Railway Opens December 9 - Official Korea Tourism Organization", "Guadarrama Tunnel (Segovia, 2007) | Structurae", "Awards: China Shaanxi & Hebei - cn/76 High Speed Railway", https://www.telt-sas.com/en/the-first-9-km-of-the-base-tunnel-completed/, https://www.ledauphine.com/savoie/2018/12/18/les-travaux-du-lyon-turin-debutent-le-15-janvier, https://www.bbt-se.com/information/news/detail/news/brenner-basistunnel-zur-haelfte-ausgebrochen-baufortschritt-laeuft-nach-plan/, "Eröffnung der Koralmbahn verzögert sich bis 2026", https://steiermark.orf.at/stories/3028535/, "Journal of Modern Transportation: Key technologies for construction of Jinping traffic tunnel with an extremely deep overburden and a high water pressure", "Son dakika... Ovit Tüneli hizmete girdi", "西康高速全线贯通 陕西提前两年实现市市通高速 - 新闻频道 - 西部网(陕西新闻网)WWW.CNWEST.COM", "Toven tunnel holing imminent - tunnelbuilder.com News", "Statens vegvesen - E39 Rogfast - Nå starter vi! See also: List of tunnels in Switzerland. Lærdal. This tunnel is not only the world’s longest, 24.5 km ( 15.2 miles), but also the world’s most uniquely constructed tunnel with exceptional security features. Operations during the construction of Laerdal tunnel was divided into four main phases: drilling, blasting, loading and transport and excavating and landscaping. Ted Williams is one of the longest tunnels in the United States – at 1.6 miles. It was constructed between 1939 and 1945 and supplies water from Rondout Reservoir to the Chelsea Pump Station before ending at Hillview Reservoir in Yonkers. (The world’s second longest, the St. Gottard Tunnel in Switzerland, is only 16.92 km, or 10 miles). Laerdal Tunnel, Norway The 24.5km Laerdal tunnel in Norway is the world’s longest road tunnel. Courtesy of the CC Second Highway Coonsultants Co. The entire line, including all track and stations, is located in underground tunnels. Completed: 1988. Will have a record depth of 390 m below sea level. GRAN SASSO D'ITALIA, ITALY: 6.3 mi. Lærdal Tunnel. This tunnel is an … His car (like many others) would enter the tunnel via a platform, which would lower it, elevator-style, into the tunnel. At 37.9 kilometres (23.5 mi), the tunnel has the longest undersea portion of any tunnel in the world, although the Seikan Tunnel in Japan is both longer overall at 53.85 kilometres (33.46 mi) and deeper at 240 metres (790 ft) below sea level. Gotthard Base Tunnel (railway tunnel, open on 1 June 2016, 57 km) Lötschberg Base Tunnel (railway tunnel, 34.6 km) Simplon Tunnel (railway tunnel, 19.8 km) Vereina Tunnel (narrow gauge railway tunnel with car transportation, 19 km) Gotthard Road Tunnel (road tunnel, 16.9 km) Sixty years after the longest railway tunnel opened, a record-breaking car tunnel connected France and Italy beneath the highest mountain in western Europe Mont Blanc tunnel, 15 July 1965. (15.2 miles) in length. Tesla’s Elon Musk unveiled his prototype for a traffic-saving tunnel in Hawthorne, Calif. Currently the longest and most expensive rail tunnel in the world, the Gotthard Base Tunnel opened for service on 11 Dec. 2016. Largest Tunnels in the US Delaware Aqueduct is the longest tunnel in the world at 85 miles long and 13.5 feet wide. Account active See also: A further 4 km (2.5 mi) on the opposite side of the Hong Kong-China border. The Atal Tunnel is 10.5-metre wide and offers traffic density of 3,000 cars and 1,500 … It cost a reported $113.1 million to construct. Musk figures the guide wheel sets, which align the car with the walls of the tunnel, will cost $200 to $300. Few people are aware that beneath its sunny topside appearance, Los Angeles is hiding a network of secret tunnels that once served as a haven for bootleggers and partiers during the Prohibition era. The Story Behind Southern California’s Underground Tunnel Will Fascinate You. Drilled through solid rock. Dual carriageway of 6 lanes with each direction separated only by a full-height wall, thus considered to be one tube. A side tunnel (Kvitsøy Tunnel, 4 km) will connect.