The careless landing of a flying saucer cost the alien navigator a strict warning, and the earthlings a broken section of the road. It is good that the cosmic conscience did not allow the aliens to leave everything as it is. And Cornelius Udalov, as the head of the remstroykontor helped in repairing the road .. He established, so to speak, personal ties. The first story of the Guslyar cycle . According to the author's apocrypha, the first version of the story was written and first published in Bulgaria in Bulgarian in 1967, in 1969 translated by the author into Russian from the Bulgarian edition. In fact, the story "Incontrovertible Proof" was simply written on the same plot, and there is no Great Guslar in the story..