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Excavation of the world's largest diameter underwater shield tunnel breaks through 1,000 kilometers and reaches 426 meters per month, setting a world record
On the 20th, 30 meters underground on the north bank of the Yellow River in Jinan, Shandong, as the "Shanhe" shield machine 500 ring segments were assembled, the China Railway 14th Bureau...
cover tunnel photo by: Matt Brown from London, England / CC BY
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