476-foot-long machine to dig deepest railway tunnel beneath Yangtze River
SMRTR summary
China has completed "Linghang," a massive 476-foot-long tunneling machine built to dig the deepest high-speed railway tunnel beneath the Yangtze River in Nanjing. The tunnel will reach 351 feet underground and handle extreme water pressure, making it the deepest such project along the river. A smart double-layer shell design allows the outer casing to stay behind as permanent tunnel support, simplifying dismantling in tight underground spaces.
SMRTR provides this summary for quick context. The original article belongs to Interesting Engineering.
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