This is the first Russian book based on documents from military archives, about aliens, flying saucers, contacts with extraterrestrial civilizations and parallel worlds from the famous documentary filmmaker, author and host of the Military Secret program Igor Prokopenko. The author worked on the book for twenty years, it included truly sensational materials: reports of military pilots on UFO attacks, reports of nuclear submarine commanders on meetings with objects of extraterrestrial origin, reports of the chief of special intelligence of the Navy, directives of the Commander-in-Chief of the Navy... There is not a single line of rumors and speculation in this book. Each fact cited, no matter how fantastic it may seem, is confirmed by documents, or by participants in events. Is there a UFO? You will learn the absolutely exact answer from this book...