The Dalian bay undersea tunnel is the first cross-sea tunnel in northern China. It is an essential project concerning the wellbeing of Chinese nationals and the revitalization of old industrial bases in northeast China and it will greatly relieve the heavy traffic congestion from north to south of Dalian.

On March 9, the construction of its second immersive tube is under way. Precisely installing this 180-meter-long tube, which weighs 57,500 tons, to the first immersive tube, which was installed two months ago, is a challenging job. Join CGTN for a live view.