A Chinese company, the China National Offshore Oil Corporation (CNOOC), has successfully developed the world's first megawatt-level seawater electrolyzer for hydrogen production, a major milestone in green energy innovation. The electrolyzer, compactly built within five shipping containers, has the capacity to produce 200 normal cubic meters of hydrogen per hour with exceptional purity. Utilizing surplus electricity generated by offshore wind and solar farms, the system leverages the abundant seawater resource for electrolysis, offering advantages over traditional freshwater electrolysis. Despite seawater's complex composition posing challenges, CNOOC's engineers have devised a groundbreaking solution that allows direct feeding of raw seawater into the electrolyzer without prior purification, ensuring stable and cost-effective operation. This breakthrough technology opens a new chapter in green hydrogen production, potentially revolutionizing energy consumption at sea. The successful test run signifies a significant step towards establishing a sustainable model for green hydrogen-based energy consumption, emphasizing the potential for offshore energy development to embrace environmentally friendly practices.