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The SZB project includes a 6.7 km-long (4.2 mi) immersed tube which also will be the world's widest immersed tube, carrying eight traffic lanes. [11] Prior to the completion of the Marmaray and HZMB tunnels, the Transbay Tube in San Francisco Bay, completed in 1969, was the world's deepest and longest immersed tube, at 41 metres (135 ft) below ...
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.
Longest conventional railway tunnel. It is also the world's longest transit tunnel by geodetic distance; 55.782 km (34.661 mi) between the two portals. Total 151.84 km (94.35 mi) of broken out tunnels through solid rocks. [6] [7] Part of the NRLA. Metro Beijing Subway Line 10: Beijing, China
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 Seikan Tunnel is the world's longest tunnel with an undersea segment: 53.8 km: 240 m: 1971–1988 Flekkerøy Tunnel: Flekkerøy, Norway: Connecting the island community of Flekkerøy in southern Norway to the mainland: 2.3 km: 101 m: 1986–1989 Sydney Harbour Tunnel: Sydney, Australia: 2.8 km: 1988–1992 Channel Tunnel: England – France
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 G42 16 Chengdu-Lijiang Expressway: Qianhaiwan Tunnel China 6.280 km (3.902 mi) 2024 2
The Marmaray Tunnel was opened to passenger traffic on 29 October 2013. In March 2019 the overground part of the Marmaray project were completed and normal train traffic, including commuter (entire line), YHT and freight services started to run through the tunnel. The tunnel is the deepest immersed tube tunnel in the world.