After the START II–the second strategic weapons reduction treaty with the former URSS–was signed, the US Navy had to reconvert many of their Ohio-class nuclear submarines, giving new uses to their missile bays. They talked with Lockheed Martin about it, who came up with the idea of the Cormorant: a Halo-looking plane that launches from a submerged submarine, does its mission stealthily and then returns to the water, where it’s retrieved by a robot. As the video shows, the idea looks out of a sci-fi movie: