The intended aim of the paper is to make an effort to analyse several methods of building safety systems from the standpoint of probability of occurrence of an unpredictable hazardous critical accidents (crisis situation). Such being the case, there arises a necessity to build safety systems in the course of the critically circumstances (crisis situation). To satisfy this objective, the already existing safety systems are used and enriched with new components introduced to supplement them. Some conclusions in this field have been reached in the paper. The problem has been included with such events like the flood in Poland, Tsunami, Katrina hurricane and the terrorist attack in New York and Washington.
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