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With an internal diameter of 13.7 m the tunnel under the river Yangzi in Shanghai is the widest in the world. Connecting Shanghai to the Changxing island the tunnel is 16.63 km long.

shanghai yangzi tunnel

shanghai yangzi tunnel

The tunnel drill used is also the widest in the world.

shanghai yangzi tunnel

shanghai yangzi tunnel

The official website (in Chinese): http://www.shcjsq.com/index.jsp

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