China's latest intelligent shield tunneling technology has been successfully applied in the Chongtai Yangtze River Tunnel, a key project for the Shanghai-Chongqing-Chengdu High Speed Railway.

SOURCE China Railway Tunnel Group (CRTG).

https://www.prnewswire.com/news-releases/chongtai-yangtze-river-tunnel-a-successful-trial-of-chinas-intelligent-shield-tunneling-technology-302314037.html