The book of Natalia Молчановой tells a living clear language about processes what be going on in the organism of ныряльщика to, in time and after immersions on a depth. In addition, in a book in detail talked about that, how correctly to prepare to diving, prevent possible баротравмы and avoid unpleasant submarine surprises, large attention is spared to accident prevention in recreational and sporting фридайвинге. It is the real alphabet фридайвинга, allowing to do this type of entertainment and sport simpler, nearer and safer.Author of book Natalia Vadimovna Молчанова is man-legend, possessor of enormous amount (more than 40) of world records on фридайвингу, president and leading instructor on фридайвингу Federation of фридайвинга Russia, candidate of pedagogical sciences, associate professor of department of theory and methodology of the applied types of sport and extreme activity РГУФКСиТ.