An underwater data centre (R) being developed by Chinese maritime technology company Highlander is seen under construction at a shipyard in Nantong, in China's eastern Jingsu province on September 11, 2025. Power-hungry data centres run hot, so one Chinese company is planning to submerge a pod of servers in the sea off Shanghai with hopes of solving computing's energy woes. (Photo by AFP) / China OUT / To go with AFP story China-technology-science-climate-energy, FOCUS by Emily WANG, Jing Xuan TENG (Photo by STR/AFP via Getty Images)