Energy Observer is the first hydrogen-powered boat that will sail around the world. Its value is 5.5 million dollars, and it will tour the world for 6 years. It is powered by wind (wind turbines and dragons), solar energy, and hydrogen. Hydrogen is produced via water electrolysis in a way that seawater is first desalinized and then used in the electrolyzer. Produced hydrogen is pressurized in the storage tanks.
More on the link: http://www.energy-observer.org/actu/en/energy-observer-the-first-hydrogen-vessel-around-the-world/