The future after natural disasters. Most of the land is hidden under water. There is a great need for the development of unmanned vehicles. A UAV equipped with artificial intelligence picks up an SOS signal and flies out to help people who find themselves in a dangerous situation. Is it possible to save them and at the same time solve a logical problem: self-preservation or self-sacrifice? A book for those who strive to come up with and invent something useful, important and necessary for posterity. Get inspired!