A technician from China Railway 14th Bureau Group Co., Ltd. debugs a crane inside the "Yongzhou" shield tunneling machine in the Jintang undersea tunnel of Ningbo-Zhoushan Railway in east China's Zhejiang Province, Feb. 25, 2025. The 16.18-km Jintang undersea tunnel under construction connects the Jintang islet of Zhoushan and the coastal area of Ningbo in Zhejiang Province and is an important facility for a high-speed railway line connecting cities of Ningbo and Zhoushan in the province. (Xinhua/Huang Zongzhi)