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The newly opened Shenzhen-Zhongshan Line is a marvel of modern engineering, connecting two major cities in the Pearl River Delta: Shenzhen and Zhongshan. After seven years of construction, China has opened the new Shenzhen-Zhongshan Line, a 24km-long system of bridges and undersea tunnels. The architectural marvel has broken 10 world records, including the longest span for an offshore suspension bridge and the widest undersea tunnel. By cutting travel time between Shenzhen and Zhongshan from two hours to 30 minutes, the line will be a vital part of the region’s transport infrastructure, easing travel in one of the most densely populated areas in the world. The Pearl River Delta, where the Pearl River empties into the South China Sea, is one of the most densely populated areas in the world. It includes Hong Kong, Macau and nine cities in Guangdong province, separated by vast stretches of water, making getting around the region a challenge. The Shenzhen-Zhongshan Line aims to fix that. The 24km-long road connects the two cities on opposite sides of the Pearl River Delta. But it’s not just a long bridge – there’s an underwater tunnel in the middle, running between two artificial islands, with bridges connecting each island to the city on the near side. With eight lanes that can reach speeds of up to 100km/h, the line cuts a two-hour journey to 30 minutes. The Shenzhen-Zhongshan Line set 10 new world records, although they are quite specific and concrete: Largest span for an all-sea box girder suspension bridge (1,666 m) Highest bridge deck (91 m) Highest navigation clearance for an offshore bridge Largest anchor for an offshore suspension bridge (344,000 m³) Highest wind resistance test speed for a suspension bridge (83.7 m/s) Largest hot mix epoxy asphalt coated steel bridge deck (378,800 m²) Longest two-way eight-lane subsea tubular tunnel (5,035 m) Widest subsea steel-concrete tunnel assembled from submersible elements (up to 55.6 m) Largest one-time concreting volume for a submersible element steel shell using self-compacting concrete concrete (29,000 m³ per pipe section) The widest multi-fold M-shaped waterproofing used at the final joint of a tunnel with an immersion pipe (3 m)