List of long tunnels by type

Columns: Name | Location | Length in km ( mi ) | Year Completed | Line
Gotthard Base Tunnel | Switzerland ( Alps ) | 57.1 km ( 35.5 mi ) | 2016 | Gotthardbahn Luzern / Zürich - Milan | Seikan Tunnel | Japan ( Tsugaru Strait ) | 53.9 ( 33.5 ) | 1988 | Kaikyo Line ( Hokkaidō Shinkansen ) | Channel Tunnel | France/United Kingdom ( English Channel ) | 50.5 ( 31.3 ) | 1994 | Channel Tunnel | Yulhyeon Tunnel | South Korea ( Gyeonggi ) | 50.3 km ( 31.3 mi ) | 2016 | Suseo High Speed Railway | Songshan Lake Tunnel | China ( Dongguan ) | 35.391 km ( 22.0 mi ) | 2016 | Dongguan-Huizhou Intercity Railway | Lötschberg Base Tunnel | Switzerland ( Bernese Alps ) | 34.5 ( 21.4 ) | 2007 | Lötschbergbahn Brig - Thun ( - Bern - Basel ) | New Guanjiao Tunnel | China ( Qinghai ) | 32.645 km ( 20.3 mi ) , 2 tubes | 2014 | Qinghai-Tibet Railway | Guadarrama Tunnel | Spain ( Sierra de Guadarrama ) | 28.4 km ( 17.6 mi ) | 2007 | LAV Madrid - Valladolid

Example questions:
Under what strait is the rail tunnel that was finished at the earliest date ? | In what month did the most recently completed rail tunnel open for service ? | In what month did the longest rail tunnel open up ? | When did construction begin on the rail tunnel line that opened the most recently ?

Answers:
Tsugaru Strait | September | June | 2011