The Haitai Yangtze River Tunnel, currently the world's longest underwater shield tunnel for highways, has reached its deepest point at 75 meters below the Yangtze River's estuary. This milestone was achieved by the "Jianghaihao" shield machine completing a 5,316-meter excavation, setting a new record for国产 (domestic) large-diameter shield machines operating underwater. The project signifies a major advancement in China's underwater shield tunneling technology for large diameters, high water pressures, and deep burial depths. AI
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RANK_REASON This is a civil engineering achievement, not directly related to AI.