In the near future, almost the whole earth was under water as the polar ice caps melted. Sailor travels on his boat and found him in a way very different people. Without exception, all the inhabitants of the Water World are afraid of gangsters who travel by motor boats and do not give up in the dreams of finding the remains of the land. The biggest value in this world are freshwater, terrestrial plants and soil. When Mariner arrives in the middle of the settlement of the ocean, it is mistaken for a spy bandits, and after he detected the gills, then sentenced him to death. But the penalty is canceled, because the atoll attack the bandits and in the general confusion of the Mariner manages to escape with the help of local residents.