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A key part of tube installation for an undersea tunnel mega project was completed on January 22 in the Guangdong-Hong Kong-Macao Greater Bay Area. The undersea tunnel, a huge transport link between the cities of Shenzhen and Zhongshan, will be the widest of its kind in the world once completed, designed to be an eight-lane bidirectional expressway, with a total length of some 24 kilometers.