1.Bering Strait Cross-Harbour Tunnel The Bering Strait Crossing is a 105-kilometer-long tunnel that runs under the Bering Strait and is called "the world's longest undersea tunnel. It connects Siberia in Russia and Alaska in the United States, and can be said to be a very magnificent construction project for mankind.
2.Japan Seikan Cross-Harbour Tunnel The Seikan Tunnel is an undersea tunnel located in the Tsugaru Strait in Japan. The tunnel runs from Hamana, Imaibetsu-cho, Aomori Prefecture in the south to Yuri, Chikuchi-cho, Hokkaido in the north. The length of the tunnel is 54 kilometers, and the undersea part is 23 kilometers, and it took a total of 23 years to build.
3.Anglo-French Cross-Harbour Tunnel The Anglo-French Cross-Harbour Tunnel, also known as the Channel Tunnel and Eurotunnel, one of the top ten cross-harbour tunnels in the world, is a railroad tunnel connecting Britain and France, located between the British Port of Dover and the French Port of Calais, with a total length of 153 kilometers.
4.New Kanmon Tunnel, Japan The Shinkansen Tunnel is an undersea tunnel located between Shinkansen Station and Kokura Station on the Sanyo Shinkansen Line in Japan. It runs through the Kanmon strait, which separates Honshu Island and Kyushu Island, and is the third undersea tunnel in the Kanmon strait, with a total length of 6.3 kilometers.
5.Brooklyn - Battery Park Tunnel One of the world's top ten cross-sea tunnels, located in New York City, USA, it connects Manhattan and Brooklyn, with a total length of 2778.86 meters, making it the longest underwater tunnel in North America.
6.Qingdao Jiaozhou Bay Tunnel Qingdao Jiaozhou Bay Tunnel is located in the sea of Jiaozhou Bay, is China's Shandong Province, Qingdao City, connecting Huangdao District and Shannan District across the sea, the total length of the line 7.797 km, including 4.095 km across the sea section, officially opened to traffic on June 30, 2011.
7.Xiang'an Tunnel Xiang'an Tunnel is located at the mouth of the Jiulong River, it is a cross-sea tunnel connecting Huli District and Xiang'an District of Xiamen, its design speed is 80 km per hour, the total length of the line is 8.695 km, the total length of the cross-sea part is 6.05 km.
8. Hong Kong-Zhuhai-Macao Bridge Cross-Harbour Tunnel With a total length of 5.6 km, the Hong Kong-Zhuhai-Macao Bridge Cross-Harbour Tunnel is the world's longest road immersed tube tunnel and the only deeply buried immersed tube tunnel, as well as the first offshore immersed tube tunnel in China. The undersea tunnel adopts the design of an offshore immersed tube tunnel with a submarine section of about 5,664 meters, consisting of 33 giant immersed tubes and one final joint of the combined section, with a maximum installed water depth of over 40 meters.
9.Hong Kong Cross-Harbour Tunnel Hong Kong Cross-Harbour Tunnel, also known as the Hung Hom Cross-Harbour Tunnel, is 1.86 kilometers long, spanning the Kowloon Peninsula and Hong Kong Island, which is one of the earliest cross-harbour tunnels opened in Hong Kong, and also the one with the highest usage rate.
10.Haicang Cross-Harbour Tunnel Haicang Cross-Harbour Tunnel is a cross-sea tunnel connecting Huli District and Haicang District in Xiamen City, Fujian Province, China, formerly known as "Xiamen Second West Passage", which is located under the west sea of Xiamen and is one of the components of the "two rings and eight shoots" expressway network in Xiamen City. It is one of the components of the "inner ring" of Xiamen City's "two rings and eight projections" expressway network. The Haicang Cross-Harbour Tunnel will be completed in January 2020, with a total length of 7.1 km, of which the tunnel will be about 6.4 km long.
