List of longest tunnels

Columns: Type | Name | Location | Length | Year | Comment
Railway Twin Tube | Pajares Base Tunnel | Principado de Asturias and León , Spain | 24,667 m ( 15.3 mi ) | ( ? ? ) | Breakthrough 2008 ; opening date in question due to severe water leakage and lowering of local water tables | Water Supply | Mae Taeng-Mae Ngat Tunnel | Chiang Mai , Thailand | 25,624 m ( 15.9 mi ) | 2021 | 4.00 m in diameter . This tunnel is a part of Mae Taeng-Mae Ngat-Mae Kuang Diversion Tunnel Project | Water Supply | Mae Ngat-Mae Kuang Tunnel | Chiang Mai , Thailand | 22,975 m ( 14.3 mi ) | 2021 | 4.20 m in diameter . This tunnel is a part of Mae Taeng-Mae Ngat-Mae Kuang Diversion Tunnel Project | Railway | Follo Line | Oslo , Norway | 19,500 m ( 12.1 mi ) | 2020-2021 | Groundbreaking 2014 | Road | WestConnex | Sydney , Australia | 19,000 m ( 11.8 mi ) | 2023 ( 2019 partial completion ) | Road | Förbifart Stockholm | Stockholm , Sweden | 16,500 m ( 10.3 mi ) | 2030 | Construction started in August 2014

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