世界最长海底双向六车道高速公路隧道开工

Core Points - The construction of the world's longest underwater dual-direction six-lane highway tunnel has officially commenced, marking a significant step in the integration of transportation in the Yangtze River Delta region [1][2] - The project, known as the Ningbo-Qidong Highway, has a total investment of approximately 31.3 billion RMB and spans about 46 kilometers, connecting Ningbo to Zhoushan [1] - The underwater tunnel, measuring approximately 11.6 kilometers, is designed to handle high water pressure and complex geological conditions, utilizing advanced technologies for construction [1] Investment and Economic Impact - The completion of the Ningbo-Qidong Highway will create a "dual channel" for Zhoushan, alleviating current traffic pressure and enhancing transportation efficiency [2] - This infrastructure project is expected to strengthen connections between Zhoushan and major cities in the northern Yangtze River Delta, including Ningbo, Hangzhou, and Shanghai, thereby accelerating regional integration and development [2]