摘要：In this article are described the consequences, to which it can lead uncontrolled performing of separately dangerous work in the populated locality. As the illustration is given the catastrophe, which occurred in the German city Оppau 21 of September 1921 of year, with conducting of blasting at the chemical plant, its reasons are analyzed, the value of the substituted damage is evaluated.
关键词：civil defense;catastrophe;explosion;ammonium;Oppau city;21 September 1921 of the year;carelessness;control of the dangerous objects.
