Green Navy, in partnership with the Vallair Group, has received a EUR 1.5 million subsidy from France's Brittany Region for its Prometeo hydrogen-powered passenger vessel project. Located in La Forêt-Fouesnant, Brittany, Green Navy is developing a zero-emission catamaran equipped with optimized electric propulsion and hydrogen storage tanks. Prometeo will offer bare-boat charter services and could be sold to shipowners or public authorities for different transport purposes. The vessel's propulsion system utilizes high-efficiency electric motors, propellers, buffer storage batteries, and fuel cells that combine oxygen and hydrogen for energy. Green Navy's CEO, Charles Cardi, highlights the emission-free, quiet, and efficient operation of Prometeo, emphasizing its longer range and reduced docking times. The project aims to contribute to Brittany's renewable hydrogen deployment roadmap, offering a sustainable maritime transport solution. Green Navy plans to test the vessel in real-world conditions to provide valuable insights for future hydrogen-fuel projects in the region.