Based on The Incredible Tide by Alexander Key. Post nuclear future. Earth has been almost completely submerged by oceans. Indastria, an hyper-technological isle, is the new world capital. Conan is the only survived boy in the attempt of a bunch of austronauts to escape the earth when nuke bombs were falling. He will meet a girl named Lana (Italian name), and when she will be kidnapped by Indastria's soldiers, he'll go and try to rescue her.