Core Viewpoint - The Jinan Huanggang Road Yellow River Tunnel has successfully completed its construction and is expected to be operational by the second half of next year, significantly reducing travel time across the Yellow River from approximately 30 minutes to just 5 minutes, thereby enhancing connectivity and cooperation in the region [1][5]. Group 1: Tunnel Specifications - The tunnel spans approximately 5.75 kilometers, with a shield section measuring about 3.3 kilometers, designed for a speed of 60 kilometers per hour, featuring a single tunnel with dual-layer, bi-directional six-lane design, making it the world's largest diameter underwater shield tunnel [3]. - The construction utilized the "Shanhe" shield machine with a diameter of 17.5 meters, which faced significant challenges due to the sensitive geological conditions under the Yellow River, including high soil pressure and strict settlement control requirements [3][10]. Group 2: Construction Innovations - The Jinan Huanggang Road Yellow River Tunnel is the first single-tube double-layer shield tunnel to cross the Yellow River, optimizing underground space and investment while meeting the height requirements for public transport and emergency vehicles [5]. - Advanced technologies were employed, including a larger pressure cutter head and an intelligent equipment system, which enabled effective mud treatment and zero discharge of tailwater, ensuring safe and efficient tunneling through the Yellow River [12].