On October 22, the ultra-small-turn rock tunnel boring machine (TBM) 'Jiguang' was launched at the Shanghai base of China Railway Equipment, a CRHIC subsidiary company, with a boring diameter of 3.53m and a full length of about 40m. It will bore nearly 3958 meters in the underground plant drainage corridor of Jinyu Power Station. The application of 'Jiguang' will effectively reduce the rock disturbance of cavern excavation, avoid blasting excavation, reduce construction risks, improve construction efficiency and molding quality, realize construction mechanization, standardization and intelligence, and is expected to save six months of construction time.