China's largest homemade slurry tunnel boring machine rolls off production line

China's largest slurry tunnel boring machine (TBM) rolls off the production line in Zhengzhou, capital of central China's Henan Province, Sept. 29, 2018. The machine has a diameter of 15.8 meters, making it the largest slurry TBM designed in China. (Xinhua/Feng Dapeng)