State builders speed up undersea tunnel work

Chinese State builders participating in the building of the world's largest undersea tunnel in Qingdao, Shandong province, have boosted their construction abilities through technical innovations.

With technical enhancement, China Railway No 4 Engineering Group Co Ltd, which is building the Jiaozhou Bay Second Tunnel, made new headway on Saturday when they fully connected the northern line of the Huangdao-end land section ahead of schedule.

The tunnel will be 17.48 kilometers long, marking a new milestone in China's construction prowess, said Liu Aiwu, CREC4 project manager of the No 2 Bid of the tunnel.