State builders speed up undersea tunnel work

Staffers from CREC4 Seventh Engineering work on the Jiaozhou Bay Second Tunnel in Qingdao, Shandong province. LI PINGHUI/FOR CHINA DAILY 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. He said the total length of the main line of CREC4's No 2 Bid is 3.44 km, including 500 meters of open-cut tunnel and 2.9 kilometers of underground tunnel dug through drilling and blasting. The Second Tunnel, as a key project in Qingdao during the 14th Five-Year Plan period and a major artery in its "six horizontal and nine vertical" transport corridors in the city proper, will help boost traffic on both banks of Jiaozhou Bay, bolster integration in Jiaozhou Bay rim regions and enhance the high-standard opening-up of Qingdao.