Huanggang Road through Huanggang Road, Jinan City, Shandong Province go under Yellow River. Huanggang Road Passing Huang Tunnel in Jinan City is world largest diameter (17.5 meter excavation) underwater tunnel. Tiotal length 5755 meter. Tunnel Boring Machine section is 3290 meter.

Tunnel Boring Machine of China Railway 14th Bureau excavated more than half of 1658 meter.

Photographs.

http://pic.people.com.cn/BIG5/n1/2025/0304/c1016-40430875.html