重大进展！我国自主研制，突破万米大关！

Core Viewpoint - The completion of the 10,000-meter breakthrough by the "Pioneer" shield machine for the Chongtai Yangtze River Tunnel marks a significant milestone in the construction of this world-class cross-river tunnel project, laying a solid foundation for the full line's connectivity [1][4]. Group 1: Project Overview - The Chongtai Yangtze River Tunnel is a key project for the high-speed rail line connecting Shanghai, Nanjing, and Hefei, spanning a total length of 14.25 kilometers, with the shield section measuring 13.2 kilometers and designed for a single tunnel with dual tracks [1]. - The tunnel will allow high-speed trains to cross the Yangtze River without reducing speed, showcasing advanced engineering capabilities [1]. Group 2: Technical Achievements - The tunnel has achieved several world records, including the longest single-shield tunneling distance of 11.3255 kilometers, the highest underwater driving speed of 350 kilometers per hour, and the deepest riverbed tunnel in the Yangtze River at 89 meters below the water surface [3]. - The project represents a historic leap for China, transitioning from "catching up" to "leading" in the field of large-diameter shield tunneling technology [4].