With 8 decks, an underwater observation room, state of the art equipment, and only the most luxurious furnishings, this 400 million dollar superyacht belonging to a Russian oligarch is the world's biggest luxury sailing water craft. Russian Billionaire Andrei Igorevich Melnichenko paraded his masterpiece in the German port of Kiel, Friday, unveiling the gargantuan yacht, named only as ‘Sailing Yacht A,’ to the world.