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List of longest tunnels

Summary

This list of longest tunnels ranks tunnels that are at least 13 km (8.1 mi) long. Only continuous tunnels are included. Pipelines, even those that are buried, are excluded. The longest tunnels have been constructed for water distribution, followed by tunnels for railways.

The southwest portal of the Lærdal Tunnel in Norway, the world's longest road tunnel

World's longest tunnels (in use) edit

Type Name Location Length Year Comment
Water supply Delaware Aqueduct   New York State, United States 137,000 m (85.128 mi) 1945 4.1 m in diameter (13.2 m2). New York City's main water supply tunnel.
Water supply Päijänne Water Tunnel   Southern Finland, Finland 120,000 m (74.565 mi) 1982 16 m2 cross section. Main water supply tunnel for southern Finland, including Helsinki, drilled through solid rock.
Metro Suzhou Rail Transit Line 3-11  Suzhou, China 86,542 m (53.775 mi) 2019–2023 Suzhou Rail Transit Line 11 and Line 3 are connected at Weiting station with through trains passing by. Longest metro tunnel
Water supply Dahuofang Water Tunnel   Liaoning, China 85,320 m (53.015 mi) 2009 8 m in diameter[1] (50 m2 cross section)
Water supply Orange–Fish River Tunnel   South Africa 82,800 m (51.450 mi) 1972 Longest continuous enclosed aqueduct in the Southern Hemisphere (22.5 m2 cross section). Built to divert water from the Orange River to the Great Fish River.
Water supply Bolmen Water Tunnel   Kronoberg/Scania, Sweden 82,000 m (50.952 mi) 1987 8 m2 cross section
Metro Chengdu Metro Line 6   Chengdu, China 68,223 m (42.392 mi) 2020 Longest (independent single-line) metro/rapid transit tunnel
Hydroelectric Neelum–Jhelum Hydropower Tunnel   Muzaffarabad, Azad Kashmir, Pakistan 68,000 m (42.253 mi) 2017 Part of the 969 MW Neelum–Jhelum Hydropower Plant
Wastewater Tunel Emisor Oriente   Mexico City, Mexico 62,500 m (38.836 mi) 2019[2] 7 m in diameter. Longest wastewater tunnel.
Metro Qingdao Metro Line 1   Qingdao, China 59,818 m (37.169 mi) 2020–2021 Second longest metro/rapid transit tunnel
Metro Guangzhou Metro Line 18   Guangzhou, China 58,300 m (36.226 mi) 2021
Metro Guangzhou Metro Line 3   Guangzhou, China 57,930 m (35.996 mi)
(Excl. branch) 		2005–2018
Metro Moscow Metro Bolshaya Koltsevaya line   Moscow, Russia 57,538 m (35.752 mi)[3][4]
(Excl. branch) 		2018–2023[5] Longest metro/rapid transit circular line
Railway Twin Tube Gotthard Base Tunnel   Central Swiss Alps, Switzerland 57,104 m (35.483 mi) and 57,017 m (35.429 mi) 2016 Longest conventional railway tunnel. It is also the world's longest transit tunnel by geodetic distance; 55.782 km (34.661 mi) between the two portals. Total 151.84 km (94.35 mi) of broken out tunnels through solid rocks.[6][7] Part of the NRLA.
Metro Beijing Subway Line 10   Beijing, China 57,100 m (35.480 mi) 2008–2013
Railway Single Tube Seikan Tunnel   Tsugaru Strait, Japan 53,850 m (33.461 mi) 1988 74 m2; longest railway tunnel until 2016. Longest tunnel with an undersea section, running between Honshu and Hokkaido. Undersea section measures 23.3 kilometres (14.5 mi).
Metro Beijing Subway Line 6   Beijing, China 53,400 m (33.181 mi) 2012–2018
Water supply Želivka Water Tunnel[8]   Central Bohemian Region, Czech Republic 51,970 m (32.293 mi) 1972 9–12 m2
Metro Seoul Subway: Line 5   Seoul, South Korea 51,700 m (32.125 mi)
(longest branch) 		1995–2021 Longest metro/rapid transit tunnel until Guangzhou Metro Line 3 extension opened in 2010, crosses west to east under the Seoul Capital Area.
Metro Istanbul Metro (Line M11)   Istanbul, Turkey 51,500 m (32.001 mi) 2023-2024 Longest tunnel in Turkey
Dewatering Adit Rothschönberger Stolln[9]   Freiberg Mining Field, Germany 50,900 m (31.628 mi) 1844–1882 6 m2 cross section, longest tunnel until 1945. Part of a UNESCO World Heritage Site.
Railway Twin Tube Channel Tunnel     English Channel, United Kingdom/France 50,450 m (31.348 mi) 1994 Second longest railway tunnel until 2016. Longest underwater section, longest international tunnel (2×45 m2 + 1×18 m2), running between Folkestone, Kent, and Coquelles, Pas-de-Calais.
Railway Single Tube Yulhyeon Tunnel   Seoul Capital Area, South Korea 50,300 m (31.255 mi)[10] 2016[11] 107 m2, part of the Suseo high-speed railway.
Water supply River Arpa – Lake Sevan tunnel[12][13]   Armenia (at the time of construction   Soviet Union) 48,358 m (30.048 mi)[14] 1981 Longest tunnel built to restore ecological balance. Transfers water from the Arpa to Lake Sevan to recover its level.[15]
Water supply Pahang – Selangor Raw Water Transfer Project[16][17]   Pahang & Selangor, Malaysia 44,600 m (27.713 mi) 2014 5.2 m in diameter
Metro Wuhan Metro Line 2   Wuhan, China 44,347 m (27.556 mi) 2012–2019
Metro Shanghai Subway: Line 7   Shanghai, China 44,200 m (27.465 mi) 2009–2010
Water supply #1 Tunnel, Yellow River Diversion to Shanxi North Line   Shanxi, China 43,670 m (27.135 mi) 2011 See South–North Water Transfer Project
Water supply #7 Tunnel, Yellow River Diversion to Shanxi South Line   Shanxi, China 43,500 m (27.030 mi) 2002 See South–North Water Transfer Project
Metro Beijing Subway Line 8   Beijing, China 42,600 m (26.470 mi) 2012–2021
Metro Shanghai Metro Line 15   Shanghai, China 42,300 m (26.284 mi) 2021
Metro Chengdu Metro Line 5   Chengdu, China 42,300 m (26.284 mi) 2019
Metro Beijing Subway Line 14   Beijing, China 42,000 m (26.098 mi) 2015–2021
Metro Tianjin Metro Line 6   Tianjin, China 42,000 m (26.098 mi) 2016–2021
Metro Downtown line   MRT, Singapore 41,900 m (26.035 mi)[18][19] 2013–2017 Longest rapid transit line in South East Asia
Metro Nanjing Metro Line 3   Nanjing, China 41,567 m (25.829 mi) 2011–2015 From Xinghuolu station to Mozhoudonglu station.
Metro Suzhou Rail Transit: Line 4   Suzhou, China 41,500 m (25.787 mi) 2017
Metro Serpukhovsko-Timiryazevskaya Line (Altufyevo – Bulvar Dmitriya Donskogo)   Moscow Metro, Russia (construction started at the time of   Soviet Union) 41,470 m (25.768 mi) 1983–2002
Metro Madrid Metro: Line 12 (MetroSur)   Madrid, Spain 40,900 m (25.414 mi) 1999–2003
Metro Tocho-mae – Shiodome – Hikarigaoka (Toei Oedo Line)   Tokyo, Japan 40,700 m (25.290 mi) 1991–2000 Tokyo Metropolitan Bureau of Transportation
Hydroelectric Kárahnjúkar Hydropower Plant   Fljótsdalshreppur, Iceland 39,700 m (24.668 mi) 2003–2007 7.2–7.6 meters in diameter (45 m2 cross section). Part of a wider complex of tunnels that are 72 kilometers in length combined.
Water supply Quabbin Aqueduct   Massachusetts, United States 39,600 m (24.606 mi) 1933
Metro Chengdu Metro Line 4   Chengdu, China 39,300 m (24.420 mi) 2015–2017
Metro Chengdu Metro Line 7   Chengdu, China 38,600 m (23.985 mi) 2017
Metro Seoul Subway: Line 3 (Apgujeong–Ogeum)   Seoul, South Korea 38,200 m (23.736 mi) 1985–2010
Metro Kaluzhsko-Rizhskaya Line (Novoyasenevskaya – Medvedkovo)   Moscow Metro, Russia (at the time of construction   Soviet Union) 37,800 m (23.488 mi) 1958–1990 Longest railway tunnel 1978–1984 and from November 1987 till March 1988; longest metro/rapid transit tunnel 1990–1995
Metro Shenzhen Subway: Luobao Line   Shenzhen, China 37,497 m (23.300 mi) 2009–2011
Metro Chengdu Metro Line 1   Chengdu, China 37,470 m (23.283 mi)
(Excl. branch) 		2010–2018
Water supply Harold D. Roberts Tunnel[20]   Colorado, United States 37,464 m (23.279 mi) 1962 Diverts water from the Colorado River watershed to the South Platte River watershed for use in the Denver metropolitan area. Flows across Continental Divide. 4,465 feet (1,361 m) below the surface at its deepest point.
Metro Shenzhen Subway: Shekou Line   Shenzhen, China 36,146 m (22.460 mi) 2010–2011
Water supply Dawushan Tunnel, Niulan River Diversion to Dianchi   Yunnan, China 36,137 m (22.454 mi) 2013
Metro Circle line   MRT, Singapore 35,700 m (22.183 mi) 2009–2012
Metro Busan Metro: Line 2 (Dongwon–Jangsan)   Busan, South Korea 35,500 m (22.059 mi) 1999–2009
Railway Songshan Lake Tunnel[21]   Dongguan, China 35,391 m (21.991 mi) 2016 Dongguan–Huizhou intercity railway, longest railway tunnel in China
Metro Seoul Subway: Line 6   Seoul, South Korea 35,100 m (21.810 mi) 2001
Metro Seoul Subway: Line 7 (Cheongdam–Bupyeong-gu Office)   Seoul, Incheon, Bucheon and Gwangmyeong in South Korea 35,100 m (21.810 mi) 2000–2012
Metro Tianjin Metro: Line 5   Tianjin, China 34,800 m (21.624 mi) 2018–2021
Railway Single Track Lötschberg Base Tunnel   Bernese Alps, Switzerland 34,577 m (21.485 mi) 2007 Longest land railway tunnel until Gotthard Base Tunnel was opened; two single track tubes along 12 km, only single track along 22 km. Part of the NRLA.
Metro Istanbul Metro (Line M4)   Istanbul, Turkey 34,050 m (21.158 mi) 2012
Water supply Tyne-Tees Tunnel   England, United Kingdom 34,000 m (21.127 mi) 1983 (and earlier) Northumbrian water supply tunnel.
Metro Guangzhou Metro: Line 8   Guangzhou, China 33,900 m (21.064 mi) 2010–2020
Metro Lyublinsko-Dmitrovskaya Line (Zyablikovo – Seligerskaya)   Moscow Metro, Russia (construction started at the time of   Soviet Union) 33,400 m (20.754 mi) 1995–2018
Metro Madrid Metro: Line 7   Madrid, Spain 32,919 m (20.455 mi) 1974–2007
Railway Twin Tube New Guanjiao Tunnel   Qinghai, China 32,645 m (20.285 mi) 2014[22] Longest tunnel on the upgraded dual-track Xining–Golmud section of Qinghai–Tibet Railway, longest railway tunnel in China until 2016, 3323.58–3380.97 meters above sea level
Metro Meijo Line – Meikō Line   Nagoya Municipal Subway, Japan 32,400 m (20.132 mi) 1965–2004
Metro Guangzhou Metro: Line 2   Guangzhou, China 32,000 m (19.884 mi) 2010
Metro Rathaus Spandau–Rudow (U7)   Berlin U-Bahn, Germany 31,800 m (19.760 mi) 1924–1984
Water supply Gerede Water Transmission Tunnel[23]   Ankara, Turkey 31,592 m (19.630 mi) 2019[24] 5.2 m in diameter
Metro Seoul Subway: Bundang Line (Seoul Forest–Jukjeon)   Seoul, Seongnam and Yongin in South Korea 31,400 m (19.511 mi) 1994–2012
Metro Daegu Metro: Line 2   Daegu and Gyeongsan in South Korea 31,400 m (19.511 mi) 2005–2012
Wastewater Milwaukee Metropolitan Sewerage District Deep Tunnel Phase 1   Milwaukee County, Wisconsin, United States 31,221 m (19.400 mi) 1993 405 million gallons of combined sewage storage designed to prevent sewage overflow into Lake Michigan. The largest of three phases, totalling 521 million gallons of storage.[25]
Metro Beijing Subway: Line 1   Beijing, China 31,040 m (19.287 mi) 1971–2000
Metro Bucharest Metro: Line M1   Bucharest, Romania 31,010 m (19.269 mi) 1979–1992 8,670 m, shared with M3 line. Nether less one continuous tunnel.
Metro Côte-Vertu – Montmorency (Line 2 Orange)   Montreal Metro, Canada 30,798 m (19.137 mi) 1966–2007
Metro Shanghai Subway: Line 2   Shanghai, China 30,187 m (18.757 mi) 2000
Metro Parnas – Kupchino (line 2)   Saint Petersburg Metro, Russia (construction started at the time of   Soviet Union) 30,100 m (18.703 mi) 1961–2006
Metro Guangzhou Metro: Line 5   Guangzhou, China 29,900 m (18.579 mi) 2009
Water supply Shandaken Tunnel   Catskill Mountains, New York, United States 29,780 m (18.504 mi) 1924
Metro Shanghai Subway: Line 8   Shanghai, China 29,650 m (18.424 mi) 2007–2009
Metro Prospekt Veteranov – Devyatkino (line 1)   Saint Petersburg Metro, Russia (at the time of construction   Soviet Union) 29,600 m (18.393 mi) 1955–1978
Metro Shanghai Subway: Line 10   Shanghai, China 29,600 m (18.393 mi) 2010
Water supply Evinos – Mornos Tunnel[26][27]   Aetolia-Acarnania, Greece 29,400 m (18.268 mi) 1995
Metro Chengdu Metro Line 2   Chengdu, China 29,000 m (18.020 mi) 2012–2013 Only includes phases 1 and 2
Water supply Hultman Aqueduct[28]   Eastern Massachusetts, United States 28,640 m (17.796 mi) 1939 11.5 ft (3.5 m) to 14 ft (4.3 m) diameter (15m2 cross section); offline for rehabilitation
Metro Sydney Metro Northwest   Sydney, New South Wales, Australia 28,500 m (17.709 mi) 2019 The line incorporates the existing 13 km Epping to Chatswood rail link. It forms part of the wider Sydney Metro project.
Railway Twin Tube Guadarrama Tunnel[29]   Sierra de Guadarrama, Spain 28,377 m (17.633 mi) 2007
Water supply MetroWest Water Supply Tunnel[30]   Eastern Massachusetts, United States 28,300 m (17.585 mi) 2003 14 ft (4.3 m) diameter (15m2 cross section)
Railway Twin Tube West Qinling Tunnel   Gansu, China 28,236 m (17.545 mi) 2016 Chongqing–Lanzhou railway
Metro Taipei Metro: Blue Line   Taipei, Taiwan 28,200 m (17.523 mi) 1999–2015
Metro Beijing Subway: Line 4   Beijing, China 28,165 m (17.501 mi) 2009–2010
Metro Seoul Subway: Line 9 (Gimpo Airport–Sports Complex)   Seoul, South Korea 28,100 m (17.461 mi) 2009–2015
Railway Single Tube Taihang Tunnel[31]   Taihang Mountains, China 27,848 m (17.304 mi) 2007 On Shijiazhuang–Taiyuan high-speed railway
Metro Morden–East Finchley (Northern line)   London Underground, England, United Kingdom 27,800 m (17.274 mi) 1890–1940 Longest railway tunnel in UK
Metro Shenyang Subway: Line 1   Shenyang, China 27,800 m (17.274 mi) 2010
Water supply Melamchi Water Tunnel[32]   Melamchi to Kathmandu, Nepal 27,000 m (16.777 mi) 2021[33] See Melamchi Water Supply Project
Metro Seoul Subway: Incheon Line 1 (Bakchon–International Business District)   Incheon, South Korea 27,000 m (16.777 mi) 1999–2009
Metro Dainichi–Nagahara (Tanimachi Line)   Osaka Metro, Japan 26,900 m (16.715 mi) 1967–1983
Particle accelerator LEP Tunnel[34]     CERN, Switzerland/France 26,659 m (16.565 mi) 1988 (breakthrough) 11.3–15.9 m2 circular ring, now used by Large Hadron Collider
Railway Single Tube Hakkōda Tunnel (Tōhoku Shinkansen)   Hakkōda Mountains, Japan 26,455 m (16.438 mi) 2010 64–74 m2
Water supply Şanlıurfa Irrigation Tunnels   Turkey 26,400 m (16.404 mi) 2005[35]
Metro Shanghai Subway: Line 9   Shanghai, China 26,263 m (16.319 mi) 2007–2010
Hydroelectric Gilgel Gibe II Power Station headrace tunnel   Ethiopia 26,000 m (16.156 mi) 2005–2009 Tunnel partially collapsed, was repaired in 2010.[36][37]
Water supply #5 Tunnel, Yellow River Diversion to Shanxi South Line   Shanxi, China 26,000 m (16.156 mi) 2002 See South–North Water Transfer Project
Metro Daegu Metro: Line 1   Daegu, South Korea 25,900 m (16.094 mi) 1997–2002
Metro MRT Blue Line   Bangkok, Thailand 25,800 m (16.031 mi) 2004 Second phase will be open in April 2019
Railway Single Tube Iwate-Ichinohe Tunnel   Ōu Mountains, Japan 25,810 m (16.038 mi) 2002
Water supply Sudbury Aqueduct   Eastern Massachusetts, United States 25,750 m (16.000 mi) 1878 Emergency backup use
Metro Suzhou Rail Transit: Line 1   Suzhou, China 25,739 m (15.993 mi) 2007–2011
Metro Line 3 (Athens Metro)[38]   Athens, Greece 25,200 m (15.659 mi) 1992–2022 Line 3 is actually 46.5 km long, but only 25.2 km of it are underground.
Metro Helsinki metro (Kivenlahti–Sörnäinen)  

Espoo and Helsinki, Finland

25,200 m (15.659 mi) 1982–2022
Metro Taipei Metro: Orange Line (Huilong – Nanshijiao)   Taipei, Taiwan 25,100 m (15.596 mi)
(Excl. branch) 		1998–2013
Railway Twin Tube Musil Tunnel[39][40]   Wonju–Jecheon (Jungang Line), South Korea 25,080 m (15.584 mi) 2021[41]
Railway Twin Tube Pajares Base Tunnel   Asturias/León, Spain 24,667 m (15.327 mi) 2023
Road Lærdal Tunnel   Lærdal – Aurland, Norway 24,510 m (15.230 mi) 2000 The longest road tunnel in the world
Metro Yellow Line (Delhi Metro): GTB Nagar – Qutub Minar[42]   Delhi, India 24,000 m (14.913 mi) 2004–2010 Longest tunnel in India
Metro Madrid Metro: Line 1   Madrid, Spain 23,876 m (14.836 mi) 1919–2007
Railway Lainzer/Wienerwaldtunnel   west of Vienna, Austria 23,844 m (14.816 mi) 2012 Breakthrough 2007
Wastewater Harbour Area Treatment Scheme (HATS) Stage 1[43]   Hong Kong, China (construction started in   British Hong Kong) 23,600 m (14.664 mi) 2001
Water supply Eucumbene-Snowy Tunnel[44][45]   New South Wales, Australia 23,500 m (14.602 mi) 1965 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Railway South Lüliangshan Tunnel[46]   Shanxi, China 23,473 m (14.585 mi) 2014[47] 2 tubes, part of Shanxi–Henan–Shandong railway
Metro Madrid Metro: Line 6   Madrid, Spain 23,472 m (14.585 mi) 1979–2007
Metro Angrignon – Honoré-Beaugrand (Line 1 Green)   Montreal Metro, Canada 23,262 m (14.454 mi) 1966–2007
Metro Warsaw Metro Line 1: Kabaty – Młociny   Warsaw, Poland 23,100 m (14.354 mi) 1983–2008
Metro Beijing Subway: Line 2   Beijing, China 23,100 m (14.354 mi) 1969–1987
Hydroelectric Xinma Hydroelectric Power Station Water Tunnel   Sichuan, China 22,975 m (14.276 mi) 2009
Railway Iiyama Tunnel[48]   Iiyama, Japan 22,225 m (13.810 mi) 2015
Railway Daishimizu Tunnel   Mount Tanigawa, Japan 22,221 m (13.807 mi) 1982 Longest railway tunnel until Seikan Tunnel was opened.
Water supply Eucumbene-Tumut Tunnel[44]   New South Wales, Australia 22,200 m (13.794 mi) 1959 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Road WestConnex   Sydney, New South Wales, Australia 21,800 m (13.546 mi) 2023
(2019–2020 partial completion) 		New M4 Tunnels opened 2019, WestConnex M8 opened 2020
Railway Daegwallyeong Tunnel   Pyeongchang–Gangneung (Gyeonggang Line), South Korea 21,755 m (13.518 mi) 2017[49]
Water supply Vorotan–Arpa Tunnel[50]   Armenia (construction started at the time of   Soviet Union) 21,652 m (13.454 mi) 2004
Particle accelerator (incomplete) UNK proton accelerator   Protvino, Russia (construction started at the time of   Soviet Union) 21,000 m (13.049 mi) 1994 (breakthrough) Construction stopped after finishing of main circle tunnel, future is unclear
Metro Guangfo Metro   Foshan, China 20,900 m (12.987 mi) 2010
Railway Twin Tube Luliangshan Tunnel   Shanxi, China 20,785 m (12.915 mi) 2011 2 tubes: left tube is 20785 meters, right tube is 20738 meters
Metro Shanghai Subway: Line 4   Shanghai, China 20,740 m (12.887 mi) 2005–2007
Metro Barcelona Metro: Line 1   Barcelona, Spain 20,700 m (12.862 mi) 1926–1992
Hydroelectric Ward Tunnel[citation needed]   California, United States 20,610 m (12.806 mi) 1920–1925 Part of the Big Creek Hydroelectric Project of the Southern California Edison Company. Excavated through solid granite.
Metro Busan Metro: Line 1 (Hadan-Busan Nat'l Univ. of Education)   Busan, South Korea 20,600 m (12.800 mi) 1985–1994
Metro Xian Subway: Line 2   Xi'an, China 20,500 m (12.738 mi) 2011
Metro Daejeon Metro: Line 1   Daejeon, South Korea 20,470 m (12.719 mi) 2006–2007
Metro Nanjing Metro Line 2   Nanjing, China 20,380 m (12.664 mi) 2010
Metro Shanghai Subway: Line 6   Shanghai, China 20,336 m (12.636 mi) 2007
Railway Geumjeong Tunnel[51]   Busan, South Korea 20,323 m (12.628 mi) 2010 Gyeongbu high-speed railway
Railway Twin Tube Wushaoling Tunnel   Wuwei, China 20,060 m (12.465 mi) 2006–2007 2 tubes: left tube is 20060 meters, right tube is 20050 meters
Metro Istanbul Metro (Line M5)   Istanbul, Turkey 20,000 m (12.427 mi) 2017–2018 M5 line (Üsküdar-Çekmeköy) is 20 km with depot line. Line is 30.9 km with Çekmeköy-Sultanbeyli Phase.
Electric power transmission tunnel The London Connection[52]   London, England, United Kingdom 20,000 m (12.427 mi) 2005[53] National Grid plc, 3-metre diameter, 400 kilovolt circuit
Railway Twin Tube Simplon Tunnel     Lepontine Alps, Switzerland/Italy 19,803 m (12.305 mi) 1906 Parallel tunnel was opened in 1922 (19,824 m long); longest transit tunnel until Daishimizu Tunnel was opened. Part of the NRLA.
Railway Follo Line   Oslo, Norway 19,500 m (12.117 mi) 2022[54][55] Groundbreaking 2014[56]
Metro Koltsevaya Line (Circle Line)   Moscow Metro, Russia (at the time of construction   Soviet Union) 19,400 m (12.055 mi) 1950–1954
Hydroelectric Futang Hydroelectric Power Station Water Tunnel   Sichuan, China 19,319 m (12.004 mi) 2004[57]
Metro Seoul Subway: Bundang Line (Suwon station–Jukjeon station)   Yongin and Suwon in South Korea 19,300 m (11.992 mi) 2007–2013
Railway Single Tube Qamchiq Tunnel[58]   Angren–Pap railway, Uzbekistan 19,200 m (11.930 mi) 2016 Longest non-metro railway tunnel in ex-USSR
Metro North East line   MRT, Singapore 19,200 m (11.930 mi) 2003–2011 World's first fully automated and driverless underground rapid transit line
Metro Suzhou Rail Transit: Line 2   Suzhou, China 19,146 m (11.897 mi) 2009–2012
Metro Maskoŭskaja Line   Minsk Metro, Belarus (construction started at the time of   Soviet Union) 19,100 m (11.868 mi) 1984–2014
Railway Single Track Vereina   Silvretta, Switzerland 19,058 m (11.842 mi) 1999 Single track with passing loops, metre gauge
Metro Seoul Subway: Line 4 (Ssangmun–Ichon)   Seoul, South Korea 19,000 m (11.806 mi) 1980
Wastewater Harbour Area Treatment Scheme (HATS) Stage 2[59]   Hong Kong, China 18,800 m (11.682 mi) 2015
Railway Shin-Kanmon Tunnel   Kanmon Straits, Japan 18,713 m (11.628 mi) 1975
Hydroelectric Shiziping Hydroelectric Power Station Water Tunnel   Sichuan, China 18,712 m (11.627 mi) 2010[60]
Railway Single Tube Vaglia   Bologna – Firenze, Italy 18,711 m (11.626 mi) 2009 Bologna–Florence high-speed railway
Hydroelectric Baoxing Hydroelectric Power Station Water Tunnel   Sichuan, China 18,676 m (11.605 mi) 2007
Railway Single Tube Apennine Base Tunnel   Tuscan-Emilian Apennines, Italy 18,507 m (11.500 mi) 1934
Metro Obolonsko–Teremkivska line   Kyiv Metro, Ukraine (construction started at the time of   Soviet Union) 18,480 m (11.483 mi) 1976–2013
Metro Istanbul Metro (Line M3)   Istanbul, Turkey 18,460 m (11.471 mi) 2013-2022
Railway Twin Tube Qinling Tunnel I-II   Qin Mountains, China 18,460 m (11.471 mi) 2000 2 tubes: left tube is 18460 meters, right tube is 18456 meters[61]
Hydroelectric Tatev Hydroelectric Power Station Water Tunnel   Armenia (at the time of construction   Soviet Union) 18,400 m (11.433 mi) 1970
Road Twin Tube Yamate Tunnel   Tokyo, Japan

18,200 m (11.309 mi)

2015
Railway South Taihangshan Tunnel   Shanxi, China 18,125 m (11.262 mi) 2014[62] 2 tubes, part of Shanxi–Henan–Shandong railway
Metro Shanghai Subway: Line 1   Shanghai, China 18,110 m (11.253 mi) 1995
Metro Avtozavodskaya Line   Minsk Metro, Belarus (construction started at the time of   Soviet Union) 18,100 m (11.247 mi) 1990–2005
Road Twin Tube Zhongnanshan Tunnel   Shaanxi, China 18,040 m (11.210 mi) 2007 The longest road tunnel in China
Metro Line 2 (Athens Metro)[38]   Athens, Greece 17,900 m (11.123 mi) 1991–2013
Metro Beijing Subway: Line 5   Beijing, China 17,825 m (11.076 mi) 2007
Hydroelectric Shuakhevi headrace and pressure tunnel   Shuakhevi, Adjara, Georgia 17,800 m (11.060 mi)[63] 2013–2017
Metro Ankara Metro (AKM-Koru)   Ankara, Turkey 19,660 m (12.216 mi) 1997–2014 M1 line is tunnel in Kızılay between AKM, M2 line is completely underground.
Road Jingpingshan   Sichuan, China 17,500 m (10.874 mi) 2008 The deepest transportation tunnel in China
Metro Shenzhen Subway: Longgang Line   Shenzhen, China 17,333 m (10.770 mi) 2010–2011
Metro Kholodnohirsko–Zavodska Line   Kharkiv Metro, Ukraine (at the time of construction   Soviet Union) 17,300 m (10.750 mi) 1975–1978
Metro Seoul Subway: Shinbundang Line   Seoul and Seongnam in South Korea 17,300 m (10.750 mi) 2011
Water supply Mavi Tünel (Blue Tunnel)[64]   Konya, Turkey 17,034 m (10.584 mi) 2012 Breakthrough 2007
Road Gotthard Road Tunnel   Lepontine Alps, Switzerland 16,918 m (10.512 mi) 1980
Metro Guangzhou Metro: Line 4   Guangzhou, China 16,790 m (10.433 mi) 2005
Metro İzmir Metro Line M1   İzmir, Turkey 16,750 m (10.408 mi) 2000–2023
Metro Barcelona Metro: Line 4   Barcelona, Spain 16,700 m (10.377 mi) 1929–1999
Metro Seoul Subway: Line 2 (Jamsil–Sillim)   Seoul, South Korea 16,700 m (10.377 mi) 1980–1984
Metro Barcelona Metro: Line 3   Barcelona, Spain 16,600 m (10.315 mi) 1924–2001
Metro Barcelona Metro: Line 5   Barcelona, Spain 16,600 m (10.315 mi) 1959–1983
Water supply Murrumbidgee-Eucumbene Tunnel[44]   New South Wales, Australia 16,600 m (10.315 mi) 1961 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro Istanbul Metro (Line M2)   Istanbul, Turkey 16,500 m (10.253 mi) 2000–2009
Metro Beijing Subway: Line 9   Beijing, China 16,500 m (10.253 mi) 2011–2012
Hydroelectric Jinkang Hydroelectric Power Station Water Tunnel   Sichuan, China 16,490 m (10.246 mi) 2006
Metro Madrid Metro: Line 8   Madrid, Spain 16,467 m (10.232 mi) 1998–2007
Metro Guangzhou Metro: Line 1   Guangzhou, China 16,449 m (10.221 mi) 1997
Metro Madrid Metro: Line 3   Madrid, Spain 16,424 m (10.205 mi) 1939–2007
Railway Rokkō Tunnel[65]   Mount Rokkō, Japan 16,250 m (10.097 mi) 1972
Railway Solan Tunnel[66]   Taebaek, Gangwon-do, South Korea 16,240 m (10.091 mi) 2012 Taebaek Line, includes a spiral
Hydroelectric Kemano T1 and T2[67]   CAN Kemano, Canada 16,000 m (9.942 mi) 1954-2022 Twin 16 km hydroelectric tunnels. T1 was completed in 1954 and T2 was completed in May, 2022.[68] Both are in operation.
Metro Seoul Subway: Line 7 (Suraksan–Konkuk University)   Seoul, South Korea 16,000 m (9.942 mi) 1996
Railway Münsterertunnel [de]   Tyrol, Austria 15,990 m (9.936 mi) 2012 Longest tunnel in Austria.
Railway Xiangshan Tunnel 象山隧道   Fujian, China 15,917 m (9.890 mi) 2012 2 tubes, part of Longyan–Xiamen Railway
Railway Terfnertunnel [de]   Tyrol, Austria 15,840 m (9.843 mi) 2012
Former railway Henderson Tunnel[69][70]   Front Range, United States 15,800 m (9.818 mi) 1976 Narrow gauge railway, replaced by a conveyor belt in 1999. Only one portal (served an underground mine)[71]
Metro Istanbul Metro (Line M9)   Istanbul, Turkey 15,800 m (9.818 mi) 2013–2024
Water supply Pandaoling Tunnel, Datong River Diversion to Shaanxi Project   Shaanxi, China 15,723 m (9.770 mi) 1994
Metro Copenhagen Metro: City Circle Line   Denmark 15,500 m (9.631 mi) 2019 Longest railway tunnel in Denmark and Scandinavia
Metro Budapest Metro: Line 3[72]   Hungary 15,500 m (9.631 mi) 1976–1990 Line 3 is actually 17.39 km long, but only 15.5 km of it is underground.
Railway Single Track Furka Base   Urner Alps, Switzerland 15,442 m (9.595 mi) 1982 Single track with passing loops, metre gauge
Railway Twin Tube Ceneri Base Tunnel   Lepontine Alps, Switzerland 15,400 m (9.569 mi) 2020 Part of the NRLA
Metro Seoul Subway: Line 3 (Gupabal–Geumho)   Seoul, South Korea 15,400 m (9.569 mi) 1985
Metro Tianjin Subway: Line 1   Tianjin, China 15,378 m (9.555 mi) 1976–2006
Railway Haruna   Gunma Prefecture, Japan 15,350 m (9.538 mi) 1982
Railway Single Track Severomuysky Tunnel   Severomuysky Range, Russia (construction started at the time of   Soviet Union) 15,343 m (9.534 mi) 2003
Wastewater Deer Island Outfall Tunnel[73]   Deer Island, Boston, Massachusetts, United States 15,290 m (9.501 mi) 2000 24 ft (7.3 m) diameter (42m2 cross section); discharges treated effluent into Atlantic Ocean
Railway Single Tube Firenzuola   Bologna – Firenze, Italy 15,285 m (9.498 mi) 2009 Bologna–Florence high-speed railway
Hydroelectric Inguri Hydroelectric Power Station Water Tunnel   Georgia (at the time of construction   Soviet Union) 15,279 m (9.494 mi) 1978
Metro Shanghai Subway: Line 2   Shanghai, China 15,274 m (9.491 mi) 2000 Between Zhanjianggaoke station and Lingkong Station
Water supply Jinquidi Tunnel, Niulan River Diversion to Dianchi   Yunnan, China 15,257 m (9.480 mi) 2013
Hydroelectric Baotan Hydroelectric Power Station Water Tunnel   Guangxi, China 15,200 m (9.445 mi) 2010
Railway Gorigamine Tunnel[65]   Takasaki – Nagano, Japan 15,175 m (9.429 mi) 1997
Hydroelectric Xuecheng Hydroelectric Power Station Water Tunnel[74]   Sichuan, China 15,174 m (9.429 mi) 2007
Railway Single Track Monte Santomarco   Paola – Cosenza, Italy 15,040 m (9.345 mi) 1987
Railway Single Tube Gotthard Rail Tunnel   Lepontine Alps, Switzerland 15,003 m (9.322 mi) 1882 Longest transit tunnel until Simplon Tunnel was opened.
Metro Gwangju Metro: Line 1 (Sotae station–Dosan station)   Gwangju, South Korea 15,000 m (9.321 mi) 2004
Railway Nakayama Tunnel   Gunma Prefecture, Japan 14,857 m (9.232 mi) 1982 Jōetsu Shinkansen
Water supply Dangara Irrigation Tunnel[75]   Nurek, Tajikistan (at the time of construction   Soviet Union) 14,800 m (9.196 mi) 1987
Railway Cuajone-El Sargento   Ilo-Toquepala / Cuajone Industrial Railroad – Southern Peru Copper Corporation, Peru 14,724 m (9.149 mi)[76] 1975
Railway Single Tube Mount Macdonald Tunnel   Rogers Pass, Glacier National Park, Canada 14,723 m (9.148 mi) 1989
Railway (Maglev) Misaka Sasago Tunnel   Yamanashi, Japan 14,613 m (9.080 mi) 1996 Part of the Chuo Shinkansen (Maglev). Already used as Yamanashi Test Track since 1996.
Railway Single Tube Lötschberg Tunnel   Bernese Alps, Switzerland 14,612 m (9.079 mi) 1913
Water supply Caoe River Diversion Project   Zhejiang, China 14,600 m (9.072 mi) 2011
Railway Single Tube Romerike Tunnel   Oslo – Lillestrøm, Norway 14,580 m (9.060 mi) 1999
Railway Fajiushan Tunnel[77]   Shanxi, China 14,573 m (9.055 mi) 2014 Part of Shanxi–Henan–Shandong railway.
Water supply Snowy-Geehi Tunnel[44]   New South Wales, Australia 14,500 m (9.010 mi) 1966 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro Seoul Subway: Line 4 (Isu–Beomgye)   Seoul, Gwacheon and Anyang in South Korea 14,500 m (9.010 mi) 1980–1994
Road Zigana Tunnel   Torul–Maçka, Turkey 14,481 m (8.998 mi)[78] 2023[79] Longest road tunnel in Turkey
Hydroelectric Jisha Hydroelectric Power Station Water Tunnel   Yunnan, China 14,467 m (8.989 mi) 2007
Road Twin tube Ryfylke Tunnel   Stavanger–Strand, Norway 14,400 m (8.948 mi) 2019 Longest underwater road tunnel in the world
Water supply #6 Tunnel, Yellow River Diversion to Shanxi South Line   Shanxi, China 14,400 m (8.948 mi) 2002 See South–North Water Transfer Project
Water supply Ala Mountain Pass Water Supply Project   Xinjiang, China 14,346 m (8.914 mi) 2010
Road Twin Tube Ovit Tunnel[80]   Erzurum Province–Rize Province, Turkey 14,346 m (8.914 mi) 2018
Metro Stockholm Metro: Tunnelbana 3 (Blue Line) Kungsträdgården–Hjulsta   Stockholm, Sweden 14,300 m (8.886 mi) 1975–1977
Railway Single Tube Dayaoshan Tunnel[81]   Nanling Mountains, China 14,294 m (8.882 mi) 1987
Metro Istanbul Metro (Line M8)   Istanbul, Turkey 14,270 m (8.867 mi) 2023[82]
Hydroelectric Zaramag Hydroelectric Power Station Water Tunnel[83][84]   Ardon River, North Ossetia, Russia 14,226 m (8.840 mi) 2015[85]
Water supply Tooma-Tumut Tunnel[44]   New South Wales, Australia 14,200 m (8.823 mi) 1961 Part of the 145 km tunnel network of the Snowy Mountains Scheme
Metro Metro Lisbon – Blue (Seagull) Line   Lisbon, Portugal 14,000 m (8.699 mi) 1959–2007
Metro MTR – Island line (West of Heng Fa Chuen)   Hong Kong, China (construction started at the time of   British Hong Kong) 14,000 m (8.699 mi) 1985–2014
Road Arlberg Road Tunnel   Arlberg, Austria 13,972 m (8.682 mi) 1978
Water supply Shanggongshan Tunnel, Zhangjiuhe Water Supply Project   Yunnan, China 13,941 m (8.663 mi) 2007
Hydroelectric Dayingshan #4 Hydroelectric Power Station Water Tunnel   Yunnan, China 13,932 m (8.657 mi) 2009 8.5 m in diameter (57m2 cross section)
Railway Hokuriku Tunnel   Fukui Prefecture, Japan 13,870 m (8.618 mi) 1962 Hokuriku Main Line
Railway Single Tube Xiapu Tunnel   Fujian, China 13,838 m (8.599 mi) 2009
Railway Twin Tube Yesanguan Tunnel   Hubei, China 13,838 m (8.599 mi) 2010 Tube I: 13838 meters, tube II: 13796 meters
Hydroelectric Centrala Hidroelectrică Lotru-Ciunget   Ciungetu, Romania 13,719 m (8.525 mi) 1972 5 m in diameter
Railway Single Tube Fréjus (Mont Cenis)     Alps, France/Italy (construction started in the Kingdom of Sardinia) 13,657 m (8.486 mi) 1871 Longest transit tunnel until Gotthard Tunnel was opened.
Road Twin Tube Xishan Tunnel   Shanxi, China 13,654 m (8.484 mi) 2012 Left tube: 13654 meters, right tube: 13570 meters
Railway Single Tube North Tianshan Tunnel   Xinjiang, China 13,610 m (8.457 mi) 2009
Railway Marmaray   Istanbul, Turkey 13,600 m (8.451 mi) 2013 Built next to a fault zone, between two continents
Railway Single Track Savio Rail Tunnel   Helsinki – Kerava, Finland 13,575 m (8.435 mi) 2008
Metro Busan Metro: Line 3 (Suyeong–Deokcheon)   Busan, South Korea 13,500 m (8.389 mi) 2005
Railway Twin Tube Shin Shimizu Tunnel[65]   Mount Tanigawa, Japan 13,500 m (8.389 mi) 1967
Road Mount Erlang Tunnel   Sichuan, China 13,433 m (8.347 mi) 2018 Erlangshan extra-long tunnel part of Yakang Expressway
Railway Single Track Hex River Tunnel[86]   Hex River Pass, South Africa 13,400 m (8.326 mi) 1989
Railway Wonhyo Tunnel[87][88]   Ulsan, South Korea 13,270 m (8.246 mi) 2010 Gyeongbu high-speed railway
Railway Single Tube Dabieshan Tunnel   Hubei, China 13,256 m (8.237 mi) 2008
Railway Schlern Tunnel[89]   South Tyrol, Italy 13,159 m (8.177 mi) 1993
Railway Single Tube Caponero-Capoverde   Genova – Ventimiglia, Italy 13,135 m (8.162 mi) 2001 Includes an underground station ("San Remo")
Road Twin Tube Hongtiguan Tunnel   Shanxi, China 13,122 m (8.154 mi) 2013 Left tube: 13122 meters, right tube: 13098 meters
Metro Barcelona Metro line 2   Barcelona, Spain 13,100 m (8.140 mi) 1985–1997
Railway Aki Tunnel   San'yō Shinkansen, Japan 13,030 m (8.096 mi) 1975
Many more tunnels exist that are shorter than 13,000 metres (8 mi)

World's longest tunnels (under construction) edit

Type Name Location Length Year Comment
Water Supply Kashuang Water Tunnel   Xinjiang, China 280,000 m (173.984 mi) (??) Water transfer from the snow melt of Altai Mountains to the arid region of Xinjiang[90]
Water Supply New York City Water Tunnel No. 3   New York State, United States 96,560 m (60.000 mi) 2026[91] More water supply for New York City. Partially in use.
Metro Paris Métro Line 15   Paris/Île-de-France, France 75,000 m (46.603 mi) 2025–2030 Circular line; will form the longest subway tunnel.
Railway Twin Tube Mont d'Ambin Base Tunnel     Cottian Alps, France/Italy 57,500 m (35.729 mi) 2032[92] Part of the Lyon–Turin high-speed railway. Reconnaissance tunnels under construction since 2002; construction of main tunnel started in 2016.[93]
Railway Twin Tube Brenner Base Tunnel     Stubai Alps, Austria/Italy 55,000 m (34.175 mi) 2032[94] Construction started in March 2015. Together with the already constructed Inntal Tunnel it will form the world's longest continuous railway tunnel with 64 km.[95][96]
Metro Thomson-East Coast Line   MRT, Singapore 43,000 m (26.719 mi) 2024 Excluding planned extension
Railway Yigong tunnel   Tibet, China 42,500 m (26.408 mi)[97] 2030 Part of the Sichuan–Tibet railway. Construction started in November 2020.[98]
Metro Athens Metro Line 4   Athens, Greece 38,200 m (23.736 mi)[99] 2029 Construction of 1st phase started in June 2021,[100] total length may be changed.
Railway Sejila tunnel   Tibet, China 37,900 m (23.550 mi)[101] 2030 Part of the Sichuan–Tibet railway. Construction started in November 2020.[102][non-primary source needed]
Railway (Maglev) Daiichi Shutoken Tunnel[citation needed]   Tokyo, Japan 36,924 m (22.944 mi)[citation needed] After 2027 Part of the Chuo Shinkansen (Maglev)
Mineral transportation Woodsmith Mine Tunnel Potash Project Mineral Transport System (MTS)   North York Moors, United Kingdom 36,700 m (22.804 mi)[103] (??)[104] 6 m in diameter[105] incorporating conveyor and maintenance access. Start of construction was planned for 2016, but actually started in April 2019.[106][107]
Railway Gaoligongshan Tunnel   Yunnan, China 34,538 m (21.461 mi) 2025[108] Railway between Dali and Ruili. Construction started in August 2017.[109]
Railway (Maglev) Daiichi Chukyoken Tunnel[citation needed]   Nagoya, Japan 34,210 m (21.257 mi)[citation needed] After 2027 Part of the Chuo Shinkansen (Maglev)
Metro L9   Barcelona, Spain 33,000 m (20.505 mi) (??)
(2009–2016 partial completion) 		Excluding branches. Northern section of the line is in operation since 2009-12-13. Southern section of the line is in operation since 2016-02-12. Future of central section is unclear.
Railway Twin Tube Koralm Tunnel   Koralpe, Austria 32,900 m (20.443 mi) 2026[110] Part of the Koralm Railway; boring of main tunnel started at the west portal in May 2010.[111]
Railway Oshima Tunnel   Hokkaido, Japan 32,675 m (20.303 mi) 2031 Part of the Hokkaido Shinkansen.
Metro Cross Island Line   MRT, Singapore 29,000 m (18 mi)[112] (Phase 1 only) 2030 (Phase 1)
2032 (Phase 2) 		Construction of Phase 1 started in January 2023[113]
Water Supply NCP Canal Main Tunnel   Anuradhapura East, Sri Lanka 27,800 m (17.274 mi) 2025 Part of North Central Province Canal under Mahaweli Development programme. Low slope tunnel with gravity flow, 8m in diameter. Supplies water from Moragahakanda Reservoir to North Central and Northern Provinces.[114]
Railway Twin Tube Valico Tunnel   Ligurian Apennines, Italy 27,342 m (16.990 mi)[115] 2026 Breakthrough in September 2020.[116] Part of the Tortona–Genoa high-speed railway.
Railway Twin Tube Semmering Base Tunnel   Lower Austria/Styria, Austria 27,300 m (16.963 mi) 2030[117] Construction of the first contract section started in January 2014.[118] Will cut travel time between Vienna and Graz by 30 minutes and is part of the Baltic–Adriatic Corridor
Road Rogfast tunnel   Randaberg–Bokn, Norway 26,700 m (16.591 mi) 2033[119] Construction started in January 2018, halted October 2019 due to expected cost overruns, revised plan and 48% cost increase approved November 2020; construction restarted late 2021.[120] Will be the longest road tunnel in the world, and also the deepest undersea tunnel, 392 metres (1,286 ft) below sea level. It will also have a 4,100 m (2.548 mi) connection tunnel from Kvitsøy to the main tunnel.
Railway Sasson Tunnel[citation needed]   Hokkaido, Japan 26,230 m (16.299 mi)[citation needed] 2031 Part of the Hokkaido Shinkansen.
Metro Suburban Rail Loop East   Melbourne, Victoria, Australia 26,000 m (16 mi)[a] 2035[121] Construction started in June 2022.[122] SRL North is still under early planning, projected to be completed by 2053.
Water Supply Mae Taeng–Mae Ngat Tunnel[123]   Chiang Mai, Thailand 25,624 m (15.922 mi) (??)[124] 4 m in diameter. This tunnel is a part of "Mae Taeng–Mae Ngat–Mae Kuang Diversion Tunnel Project"
Railway (Maglev) Minami Alps Tunnel[citation needed]   Akaishi Mountains, Japan 25,019 m (15.546 mi)[citation needed] After 2027 Part of the Chuo Shinkansen (Maglev)
Railway (Maglev) Chuo Alps Tunnel[citation needed]   Kiso Mountains, Japan 23,288 m (14.470 mi)[citation needed] After 2027 Part of the Chuo Shinkansen (Maglev)
Metro Metro Manila Subway   Metro Manila, Philippines 23,160 m (14.391 mi) 2028 Only for the dedicated mainline between East Valenzuela and FTI.[125] To be partially opened in 2025.[126]
Road Twin Tube Sengli Daban Tunnel   Xinjiang, China 22,035 m (13.692 mi) 2026[127] Construction started in 2020. It bypasses Sengli Daban mountain pass which sits up at 4091 meters above the sea level. Once completed, it will become the longest road tunnel in the world at an altitude of over 4000m.
Railway Thane Creek Tunnel[128]   Mumbai, India 21,150 m (13.142 mi)[129] 2028[130] Part of the Mumbai–Ahmedabad high speed railway, construction started in November 2023,[131] 13 m diameter.[132]
Railway Shin Hokuriku Tunnel[citation needed]   Fukui, Japan 19,760 m (12.278 mi)[citation needed] 2024[citation needed] Part of the Hokuriku Shinkansen
Railway Twin tube Bentong Tunnel (Genting Tunnel)   Bentong, Pahang, Malaysia 18,000 m (11.185 mi) 2027 Part of MRL East Coast Rail Link project. Will became the longest tunnel in South East Asia[133]
Railway Shiribeshi Tunnel[citation needed]   Hokkaido, Japan 17,975 m (11.169 mi)[citation needed] 2031 Part of the Hokkaido Shinkansen.
Road and railway Fehmarn Belt Fixed Link     Fehmarn Belt, Germany/Denmark 17,600 m (10.936 mi) 2029[134] Construction started in January 2021[135]
Railway Tateiwa Tunnel[citation needed]   Hokkaido, Japan 16,980 m (10.551 mi)[citation needed] 2031 Part of the Hokkaido Shinkansen.
Road Förbifart Stockholm[136]   Stockholm, Sweden 16,500 m (10.253 mi) 2030[137] Construction started in August 2014
Road Tokyo Gaikan Tunnel[citation needed]   Tokyo, Japan 16,200 m (10.066 mi)[citation needed] 2030[citation needed] Part of the C3 Tokyo Gaikan Expressway.
Railway Zhoushan underwater tunnel   Zhejiang, China 16,200 m (10.066 mi)[138] 2026[138] Part of the Ningbo–Zhoushan railway. Construction started in December 2020.[139]
Railway Twin Tube Chiltern tunnel   Chiltern Hills, United Kingdom 16,040 m (9.967 mi) 2029-2033[140] Part of High Speed 2,[141] construction started in May 2021,[142] 9.1 m internal diameter[143]
Railway Uchiura Tunnel[citation needed]   Hokkaido, Japan 15,560 m (9.669 mi)[citation needed] 2031 Part of the Hokkaido Shinkansen.
Railway (Maglev) Ina Sanchi Tunnel[citation needed]   Nagano, Japan 15,300 m (9.507 mi)[citation needed] After 2027 Part of the Chuo Shinkansen (Maglev)
Railway Devprayag Rail Tunnel[citation needed]   Uttarakhand, India 15,270 m (9.488 mi) [citation needed] 2024–2025[citation needed] Part of Rishikesh–Karnaprayag line[144]
Railway (Maglev) Hiyoshi Tunnel[citation needed]   Gifu, Japan 14,532 m (9.030 mi)[citation needed] After 2027 Part of the Chuo Shinkansen (Maglev)
Road Zoji-la Tunnel   Zoji La Pass, India 14,200 m (8.823 mi)[145] 2026 Construction started in October 2020[146]
Railway Patalpani Rail Tunnel[citation needed]   Madhya Pradesh, India 14,000 m (8.699 mi)[citation needed] 2025[citation needed]
Metro MRT Orange Line[147]   Bangkok, Thailand 13,770 m (8.556 mi) 2025 Orange Line Phase 1
Railway Twin Tube Northolt tunnel   West London, United Kingdom 13,500 m (8.389 mi) 2029-2033[140] Part of High Speed 2, construction started in October 2022.[148]
Metro İzmir Metro Line M2   İzmir, Turkey 13,500 m (8.389 mi)[149] 2026
Metro Istanbul Metro (Line M12)   Istanbul, Turkey 13,030 m (8.096 mi) 2025

World's longest tunnels (advanced planning stage) edit

Type Name Location Length Year Comment
Water supply Tibet Xinjiang Tunnel   Tibet/Xinjiang, China 1,000,000 m (621.4 mi) ??? China preparing world's longest tunnel to divert Tibet river to desert[150]
Railway Bohai Strait tunnel   Bohai Strait, China 123,000 m (76.4 mi) ??? Tunnel between Dalian on the Liaodong Peninsula and Yantai on the Shandong Peninsula.
Railway Talsinki    

Helsinki/Tallinn, Finland/Estonia

100,000 m (62.1 mi) After 2030 Awaiting financing
Water supply Qinling Tunnel, Han River Diversion to Wei River[citation needed]   Shaanxi, China 98,300 m (61.1 mi)[citation needed] ???
Railway Serra do Mar Tunnel[151]   Brazil, between São Paulo and Santos 30,000 m (18.6 mi) ???
Railway Twin Tube Tachlovice Tunnel   Prague/Beroun, Czech Republic 24,700 m (15.3 mi)[152] After 2035 Project is on hold
Metro İzmir Metro Line M3   İzmir, Turkey 22,300 m (13.857 mi) 2020s
Metro Istanbul Metro (Line M13)   Istanbul, Turkey 21,900 m (13.6 mi) 2020s
Railway and electricity Grimsel Tunnel   Grimsel Pass, Switzerland 21,720 m (13.5 mi)[153] 2025/2026 Feasibility study
Railway Twin tube Pacheco Pass Tunnels   Pacheco Pass, California, United States 21,000 m (13.0 mi) 2031 To be built as part of the California High-Speed Rail project
Road Twin tube Gohpur – Numaligarh Tunnel   Assam, India 15,600 m (9.693 mi)[154] ??? Tunnel under the Brahmaputra River
Road Twin tube Kresna Gorge Tunnel[155]   Kresna, Bulgaria 15,400 m (9.6 mi) Cancelled Part of Struma motorway, connecting Sofia and Athens.
Road Twin tube Agua Negra Tunnel     Agua Negra Pass, Argentina/Chile 14,000 m (8.7 mi) ??? Awaiting ratification by Chile[citation needed]

World's longest tunnels (abandoned) edit

Type Name Location Length Year Comment
Water supply Gadara Aqueduct Roman Empire 94,000 m (58.4 mi) 129– Water supply for the Decapolis in present-day Jordan

World's longest tunnels (proposed) edit

See also edit

 
Wikimedia Commons has media related to Tunnel.

Notes edit

  1. ^ Length does not include SRL North or West.

References edit

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