Photo taken on March 16, 2026 shows the construction site at the Huanggang Road Yellow River Tunnel in Jinan City, Shandong Province. (Photo: China News Service/Xiao Yu) The Huanggang Road Yellow River Tunnel in Jinan, east China's Shandong Province was fully completed on Tuesday, marking the dual breakthrough of the world's largest-diameter underwater shield tunnel. The Tunnel stretches 5.75 kilometers, with about 3.3 kilometers constructed using the shield tunneling method. The project deployed the "Shanhe" shield machine, featuring an excavation diameter of 17.5 meters. Designed as a single-bore, double-deck tunnel, it accommodates six lanes across two levels, with a speed limit of 60 kilometers per hour.

An aerial view taken on March 16, 2026 shows the project construction site at the Huanggang Road Yellow River Tunnel in Jinan City, Shandong Province. (Photo: China News Service/Xiao Yu)

Photo taken on March 16, 2026 shows the construction site at the Huanggang Road Yellow River Tunnel in Jinan City, Shandong Province. (Photo: China News Service/Xiao Yu)