Two immersed tube tunnel projects achieve major breakthroughs

Two mega cross-sea immersed tube tunnel projects in China have achieved major breakthroughs on December 9, marking an unprecedented record in China’s cross-sea tunnel construction. 
The first of the 18 immersed tubes for the Dalian Bay Undersea Tunnel contracted by the CCCC in north China’s Liaoning province was put on the seabed and connected with the buried section of the north shore, the first breakthrough of its kind made in the cold regions of China. This 5.1-km undersea tunnel will be a new south-north expressway in Dalian and is expected to greatly relieve traffic congestion of the city.
On the same day, world’s longest and widest steel immersed tunnel — the Shenzhen-Zhongshan River-crossing Link Project built by the company in south China’s Guangdong province saw installation of its sixth immersed tube, bringing the total length of the tunnel which has been built to nearly 1,000 m (948.5 m). Stretching 24 km, the project is scheduled to welcome traffic in 2024. It will slash the travel time between the two cities of Shenzhen and Zhongshan from 2 hours to about 30 minutes.