A staff member works inside "Jianghai," a giant self-developed tunnel boring machine deployed for the construction of the Haitai Yangtze River Tunnel, in Haimen, east China's Jiangsu Province on April 9, 2025. China on Wednesday deployed a giant self-developed tunnel boring machine (TBM) for the construction of the world's longest underwater highway TBM tunnel. (Xinhua/Ji Chunpeng)