The Chornobyl catastrophe happened 30 more than back, but spores do not calm down about her reasons, consequences and about organization of works on liquidation of these consequences. Chornobyl educed the great number of problems being far beyond the Chornobyl theme : ethic, ecological, political. Soviet system on the whole and even technical progress appeared in consciousness many compromised by this accident. To answer on arising up in connections with Chornobyl questions, knowledge is needed - that actually happened on April, 26, 1986.This book unique materials are the basis of : interview, articles and remembrances of academician Valery Легасова, one of leaders of liquidation of consequences of the Chornobyl accident, that first in the USSR and in the world on the whole analysed the consequences of catastrophe and first in detail told about them. Besides them, a book was entered by the articles oh technological and political aspects the catastrophes, written with the use of both modern materials and before not published archived documents. A book will allow to the reader to form the opinion of the Chornobyl catastrophe despite pseudo-scientific theories and politicized populist charts.A publishing layout is stored in the format of PDF A4.