The invention relates to medicine. The essence of the invention lies in that a person is placed in a spatially isolated passenger cabin of a floating centre. The person permanently stays in said cabin during the number of days individually determined therefor. Said person is visually and spatially isolated. Stay conditions are based on ordinary living conditions of humans subjected to rigorous conditions and to additional test elements. At the same time, the conditions for improving the physical conditions of said person and the intellectual level thereof are provided. The conditions of the person are observed directly and remotely with the aid of sensors. The living conditions are gradually modified, thereby improving the fitness of the person. The superstructure of a vessel is embodied in an integral manner with the hull thereof and is provided with an enclosed-space area isolated from boards by longitudinal partitions and divided into four isolated sub-areas provided with cabins arranged therein. A glass promenade deck is disposed above the enclosed-space area. The cabins are arranged in each isolated area on abridged decks which are provided with a hallways arranged therebetween. The height of the hallway is equal to the total height of all decks having cabins.