The Herrcnknecht Mixshield S-318, one of the two largest tunnel boring machines (TBM) in the world with a diameter of 15.43 m (50.6 ft), reached its target shaft on the Yangtze River island of Chansxiang in Shanghai, China on Sept. 5,2008. The machine excavated the nearly 7.5-km- (4.6-mile-) long tunnel tube in highly water-bearing construction ground in 20 months. On May 28, 2008, an identical Her-renknecht Mixshield S-317 reached its target shaft.
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