The 16.18-km-long Jintang undersea tunnel, the world's longest undersea high-speed railway tunnel in east China's Zhejiang, successfully broke through the seawall on Thursday using the 14.57-m-diameter Yongzhou tunnel boring machine (#TBM), marking the start of full-scale tunneling of its undersea section. The Yongzhou TBM has bored 2,020 meters since it began operation last May. | Modern China
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