China Now(@ChinaNow24):UNUSUAL Opening of the world’s largest underwater shield tunnel in CHINA On August 25, the Huanggang Road Tunnel was inaugurated in the Chinese city of Jinan. The tunnel runs beneath the Yellow River and is now the largest underwater shield tunnel in the world, cutting river‑crossing time to about 5 minutes. The tunnel’s excavation diameter is 17.5 meters, built using the giant shield machine “Shanhe.” It features two‑level, bidirectional traffic within a single tunnel, reducing investment costs by roughly 15% compared to dual‑tunnel systems while improving underground space efficiency.

2026.08.28 10:14

UNUSUAL Opening of the world’s largest underwater shield tunnel in CHINA On August 25, the Huanggang Road Tunnel was inaugurated in the Chinese city of Jinan. The tunnel runs beneath the Yellow River and is now the largest underwater shield tunnel in the world, cutting river‑crossing time to about 5 minutes. The tunnel’s excavation diameter is 17.5 meters, built using the giant shield machine “Shanhe.” It features two‑level, bidirectional traffic within a single tunnel, reducing investment costs by roughly 15% compared to dual‑tunnel systems while improving underground space efficiency.