List of longest tunnels

Columns: Type | Name | Location | Length | Year | Comment
Water Supply | Yunnan-Guizhou Water Tunnel | Yunnan , China | 661,000 m ( 410.7 mi ) | 2025 | Inter river basin water transfer | Water Supply | New York City Water Tunnel No . 3 | New York State , United States | 96,560 m ( 60.0 mi ) | 2020 | More water supply for New York City . Already in use ; at completion it will be the world 's third longest tunnel | Metro | Paris Metro Line 15 | Paris Petite Couronne , France | 75,000 m ( 46.6 mi ) | 2022-2030 | Circular line ; will form the longest subway tunnel | Metro | Bolshaya Koltsevaya line | Moscow Metro , Russia | 69,000 m ( 42.9 mi ) | 2018-2023 | Circular line | Railway Twin Tube | Brenner Base Tunnel | Stubai Alps , Austria - Italy | 55,000 m ( 34.2 mi ) | 2028 | 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 | Metro | L9 / L10 | Barcelona , Spain | 43,710 m ( 27.2 mi ) | 2009-2016 ( partially ) | The total system will have a length of 47.8 km , of which 43.71 km is underground and 4.09 km is on viaducts . 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 | Metro | Mass Rapid Transit ( Singapore ) : Thomson-East Coast Line | Singapore , Singapore | 43,000 m ( 26.7 mi ) | 2024 | Excluding planned extension

Example questions:
What was dedicated in 1952 in the same area as the tunnel also known as the Mineral Transport System ? | How many tunnels will the tunnel that will be the longest railway tunnel of a landlocked East Alpine country have ? | What is the population of the country that has the tunnel with the predominately underground motorway scheme ? | How many kilometres are being built underground of the tunnel in the country that is 450,295 square kilometres ?

Answers:
North York Moors National Park | two | 26 million | 17