Laying of World's Second Longest Underwater Expressway Tunnel Starts
The first section of the world' s second longest underwater expressway tunnel was laid Sunday morning in the Huangpu river in Shanghai to join with the passage entrance of a ring road on land.
The 736-meter tunnel to be laid on the river bed will have up to eight double-lanes, which are expected to join a 2,880-meter entrance passage linking up to the 100 km external ring road in Shanghai.
Designed as a section of the second ring road in Shanghai to facilitate urban traffic, the road is required to cross the Huangpu River, a busy waterway running through the city.
The tunnel laying method was determined as more economical than the construction of a bridge or a tunnel built by dredging up the river.
The first pipe in Shanghai's pioneering Outer Ring Road Tunnel was successfully laid 14 metres under the surface of the Huangpu River just after midnight Sunday.