China builds the longest undersea tunnel in the world
China's latest megaproject is a 76 mile (122 km) undersea tunnel running from Dalian to Yantai. It surpasses the combined length of the world's two longest undersea tunnels – Japan's Seikan Tunnel and the Channel Tunnel between Britain and France. With previous journeys cut by 800 miles, it forms a vital high-speed rail link between the north and south of the country, boosting economic growth significantly.
This $36 billion project is constructed in less than five years.* It is actually three parallel tunnels – one for cars, one for trains and one for maintenance, placed 100 ft below the sea bed. Vertical shafts are located on island stepping stones to provide ventilation. However, there is much controversy surrounding the route, which passes over two major earthquake fault lines.*
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