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Crossing the Bohai Strait, the tunnel would be 123 kilometers (76 mi) long, of which 90 kilometers (56 mi) would be underwater. This would exceed the combined lengths of the two longest undersea tunnels in the world, the Seikan Tunnel (23.3 km or 14.5 mi) and the Channel Tunnel (37.9 km or 23.5 mi). [2]
The 10.8 km long tunnel is part of a 140-kilometer (87 mi)-long high-speed line from Guangzhou to Shenzhen and Hong Kong. It is designed for speeds of up to 350 km/h (usually 250 km/h in operation) - the fastest underwater tunnel in the world. [2] as well as being China's longest underwater tunnel. [3]
[6] [7] The bridge and tunnel were planned together as the Jiaozhou Bay Connection Project. [8] The contiguous length of the tunnel road is about 7.8 km (4.8 mi), part of which is underground and part under the sea. [9] The sub-sea portion is 3.95 km (2.45 mi). [9] The deepest point of the crown of the tube to sea level is 74 meters. [9]
A senior adviser to the Chinese government is calling for a proposed road and rail tunnel between mainland China and its southern island province of Hainan to be put back on the agenda, to boost ...
Jisha Hydroelectric Power Station Water Tunnel Yunnan, China 14,467 m (8.989 mi) 2007 Road Twin tube Ryfylke Tunnel: Stavanger–Strand, Norway 14,400 m (8.948 mi) 2019 Longest underwater road tunnel in the world Water supply #6 Tunnel, Yellow River Diversion to Shanxi South Line Shanxi, China 14,400 m (8.948 mi) 2002
The Outer Ring tunnel, also known as the Taihe Road Tunnel, is a highway tunnel under the Huangpu River in Shanghai. The tunnel serves as part of the S20 Expressway and was completed on June 21, 2023. The tunnel runs east to west from Baoshan District to Sancha Port after crossing the Huangpu. The tunnel is 2,880 metres (9,450 ft) long and ...
Cheung Tsing Tunnel (cross-mountain) (road) Cross-Harbour Tunnel (underwater) (road) Eagle's Nest Tunnel (cross-mountain) (road) Eastern Harbour Crossing / Tseung Kwan O line (road and metro) Kai Tak Tunnel (beneath site of former Hong Kong International Airport) (road) Lion Rock Tunnel (cross-mountain) (road and water pipe)
The oldest underwater rail tunnel in the world, crossing the Mersey in Liverpool: 1.21 km: 1881–1886 Severn Tunnel: Wales – England: One of the oldest underwater rail tunnels in the world: 7.01 km: 1873–1886 Blackwall Tunnel (western) London, England: The oldest underwater vehicular tunnel in the world, crossing the Thames in London: 1.35 ...