M. : Samizdat, 1979, 237 s. Fifth volume of samizdat materials F. Yu. Siegel on UFO. The landing or landing of UFOs is one of the most amazing features of these mysterious objects. It excites our usual understanding of reality so much that we tend to dismiss it as a fictional landing message. However, almost every UFO landing leaves physical traces on the surface of the earth and these traces are usually stable enough to be subjected to objective scientific research for many months, or even years. On the other hand, reports of landings usually come from persons quite healthy, not prone to hoaxes and worthy of our trust. Often witnesses to the landing of UFOs are several people and this can be considered as another argument in favor of the reliability of their messages. Finally, a global analysis of landing reports shows that these documents are uniform across the globe. There is a general picture of events that cannot be explained by conspiracy of deceivers, hoaxes or general insanity. These facts speak in favor of the reality of UFO landings, which, of course, does not exclude, but implies a critical attitude to each specific landing message and a thorough study of the physical traces of UFO landings.