sentences:  Humanity now faces the difficult task of rebuilding their society and industry without coming into conflict with the ever-watching superpower under the sea again.The story touches various topics, including the destruction and poisoning of the marine ecosystems on earth, the importance of the sea for humanity and the coexistence of different species.The book also remarks on the human inability to thoroughly understand "alien" life; it speculates on the philosophical and religious consequence that the discovery of another sentient species on Earth may have.