Green Navy, a French marine engineering firm, has secured a €1.5 million subsidy from the government of the Brittany Region for the development of a new catamaran vessel named Prometeo. This innovative vessel will be powered by a hydrogen-electric propulsion system, offering a sustainable transportation solution for high-speed coastal travel. Prometeo is currently in its initial production phase and will feature optimized electric propulsion, hydrogen storage tanks, and fuel cells to recharge its batteries. By utilizing high-efficiency electric motors and optimized propellers, the catamaran will draw energy from buffer storage batteries while also utilizing onboard hydrogen as a complementary energy source. The hydrogen will be converted into electricity through fuel cells, recharging the batteries and ensuring a continuous power supply. Prometeo is designed to be offered as a bareboat charter solution and could be purchased by shipowners or public authorities for various travel purposes, including inter-island transportation, urban bay crossings, and leisure trips. This development represents a significant step towards sustainable and eco-friendly marine transportation, showcasing the potential of hydrogen technology in the maritime industry.