List of longest tunnels

Columns: Type | Name | Location | Length | Year | Comment
Road & Rail | Taiwan Strait Tunnel | Taiwan Taiwan Strait | 150,000 m ( 93.2 mi ) | ? ? ? | Approved since 2013 on Chinese side | Railway | Bohai Strait tunnel | Bohai Strait , China | 123,000 m ( 76.4 mi ) | ? ? ? | Railway | Talsinki | Helsinki , Finland - Tallinn , Estonia | 100,000 m ( 62.1 mi ) | after 2030 | Awaiting financing | Water supply | Qinling Tunnel , Han River Diversion to Wei River | Shaanxi , China | 98,300 m ( 61.1 mi ) | ? ? ? | Railway | Mont d'Ambin Base Tunnel | Cottian Alps , France - Italy | 57,000 m ( 35.4 mi ) | 2029 | Reconnaissance tunnels under construction ; start of construction planned for 2019 | Metro | Athens Metro Line 4 | Athens , Greece | 33,000 m ( 20.5 mi ) | 2028 | Start of construction planned for 2019 | Metro | Mass Rapid Transit ( Singapore ) : Cross Island Line | Singapore , Singapore | 29,000 m ( 18 mi ) ( Phase 1 only ) | 2029 ( Phase 1 ) 2030/2031 ( Phase 2 ) | Start of Phase 1 construction planned for 2020 Phase 2 route not announced | Railway | Barrandov Tunnel | Prague - Beroun | 24,700 m ( 15.3 mi ) | ? ? ? | Project is on hold | Road and railway | Fehmarn Belt Fixed Link | Germany - Denmark | 17,600 m ( 10.9 mi ) | 2028 | Start of construction planned for 2020 | Road twin tube | Kresna Gorge Tunnel | Kresna , Bulgaria | 15,400 m ( 9.6 mi ) | cancelled | Part of Struma motorway , connecting Sofia and Athens | Road twin tube | Agua Negra Tunnel | Chile - Argentina | 14,000 m ( 8.7 mi ) | ? ? ? | Awaiting ratification by Chile | Ship Tunnel | Stad Ship Tunnel | Selje , Norway | 1,700 m ( 1.1 mi ) | 2023 | Canal tunnel . Possible construction start in 2021

Example questions:
What is the population of the state which the longest tunnel is located in ? | When was one of the longest-running tunnel located in the birthplace of the Olympic Games approved ? | What mountain range does one of the longest-running tunnel in the eighth largest country pass through ? | What is the name of the Benedictine monastery in the municipal the smallest tunnel is located ? | What is the population of the city in which the one of the longest-running tunnel estimated to cost €9-13 billion is located in ?

Answers:
23.7 million | 25 September 2014 | Andes mountains | Selje Abbey | 650,058