On September 4, 2026, with the final rock wall at the entrance of the Jintang Subsea Tunnel of the Ningbo-Zhoushan Railway, constructed by CRCC, successfully broken through, the land section of the world's longest undersea high-speed railway tunnel was fully connected.
The Jintang Subsea Tunnel is a controlled project of the Yongzhou Railway, starting from Beilun in Ningbo in the west and ending at Jintang in Zhoushan in the east, with a total length of 16.18 kilometers. The single tunnel double track design speed is 250 kilometers per hour, and the total length of the land section is 7.83 kilometers.
The main entrance tunnel on the Beilun side of Ningbo that was connected this time is 3617 meters long, and the line crosses multiple faults and densely jointed zones. The project team uses smooth blasting combined with micro difference blasting technology, strictly controls blasting vibration, and relies on a dual warning system of advanced geological prediction and surrounding rock monitoring to ensure the safe progress of tunnel construction.
The main line of Yongzhou Railway is 76.4 kilometers long, and the overall construction progress has reached 77%. After the land section is connected, the focus of engineering construction will shift to the sea shield construction of Jintang Subsea Tunnel.