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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. [97] [98] 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) [99] 2030
An immersed tunnel is planned for the Fehmarn Belt. At 17.6 km (10.9 mi), it will be the longest ever constructed, surpassing the current largest immersed tube tunnel, which spans 6.75 km (4.19 mi) across the Pearl River Estuary in China as part of the Hong Kong–Zhuhai–Macau Bridge.
Mawan Tunnel China 6.280 km (3.902 mi) 2024 2 Mawan Cross-sea Corridor Jiuling Tunnel China 6.264 km (3.892 mi) 2026 2 G59 12 Fangxian-Wufeng Expressway: Helinyakou Tunnel China 6.260 km (3.9 mi) 2024 2 China National Highway G341: Ma'anshan Tunnel China 6.252 km (3.885 mi) 2025 2
Descending up to 40 meters beneath the Baltic Sea, the world’s longest immersed tunnel will link Denmark and Germany, slashing journey times between the two countries when it opens in 2029.
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The longest underwater road tunnel in the world Arlberg: Austria (Vorarlberg - Tyrol) 13.972 km (8.7 mi) 1978 1 S16/E60 "World's longest tunnel" 1979 - 1980: Xishan Tunnel: China 13.654 km (8.5 mi) 2012 [25] 2 S56 Shanxi Taiyuan-Gujiao Expressway Left tube：13.654 m, right tube：13.570 m New Erlangshan Tunnel [26] China
Here’s a new and unusual way to take in the London skyline: by zipping down a tunnel slide that claims to be the world’s tallest—and longest.
As of 2016, the Gotthard Base Tunnel is the longest railway tunnel in the world. It is the third Swiss tunnel to bear this title, after the Gotthard Tunnel (15 km or 9.3 mi, 1882) and the Simplon Tunnel (19.8 km or 12.3 mi, 1905). [28] It is the third tunnel built under the Gotthard, after the Gotthard Tunnel and the Gotthard Road Tunnel.