南京地铁4号线二期过江隧道顺利贯通

Core Viewpoint - The successful completion of the Nanjing Metro Line 4 Phase II underwater tunnel marks a significant advancement in urban transportation infrastructure, enhancing connectivity across key districts in the city [1][3]. Group 1: Project Overview - The total length of the Line 4 Phase II project is approximately 10 kilometers, starting from Zhenzhuquan East Station and extending eastward, ultimately connecting with the first phase at Longjiang Station [3]. - The underwater tunnel section, measuring 3062.6 meters, is a critical control node for the entire line and is part of the strategic planning for the Yangtze River's crossing channels [3]. - The tunnel features a long-distance crossing of 2200 meters through the main section of the Yangtze River, with the lowest point reaching 68.58 meters below the water surface, setting a record for the deepest underwater metro tunnel in the Yangtze River Delta region [3]. Group 2: Impact on Urban Transportation - This is the third underwater metro tunnel completed in Nanjing, which will further enhance the urban rail transit network and significantly improve cross-river travel efficiency for residents along the route [5].