![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)](http://www.ecns.cn/hd/2018/09/30/1603bf1122a94f7d924acdb8a9ce9f0e.jpg)
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)
![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)](http://www.ecns.cn/hd/2018/09/30/6ded23c505954a7abda11f36f615cd0e.jpg)
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)
![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)](http://www.ecns.cn/hd/2018/09/30/d2a16e8b50c5485dabd98912d3ef4c90.jpg)
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)
![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)](http://www.ecns.cn/hd/2018/09/30/d2f9b67592144dc7b1222e050ab48429.jpg)
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)