Big Bertha is really, really big. The size of the massive tunnel boring machine that will churn its way under the Seattle waterfront was dramatically shown as the cutter head was lowered into its ...
BEIJING -- China's domestically developed, world's largest-diameter high-speed-rail shield tunneling machine "Linghang" surpassed the 10,000-meter mark on Tuesday, leaving just 1,000 meters to reach ...
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