A ship’s captain lives in an old submarine, which is inexplicably – and precariously – perched at the tippy-top of a mountain, far, far above the ground. Keeping the craft balanced is a neverending, delicate – and at times hilarious – challenge. One day, a seagull comes to visit and the equilibrium of the ship is threatened and the captain must take drastic measures to preserve his home. Plagued by guilt, he finds he must make a life-changing decision.