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This paper contains the results of studies of the cognitive model developed information technology interdependence and interrelation of complex technical systems to assess their vulnerability. A general block diagram of a ship interconnectedness of complex technical systems. The interaction of ship power plant units, the power supply system of the ship and ship's auxiliary systems in extreme emergency situations. Based on the results of research developed an information processing model of cognitive functioning marine interdependence of complex technical systems. In accordance with the established algorithm vulnerability assessment information elements of the cognitive model calculated the coefficients of the structural vulnerability of its elements. The calculation results have allowed to identify the most critical elements of the model in terms of reliability. The results of research and development will improve the efficiency of operation of complex technical systems that provide high-quality prediction of the reliability of their operation in extreme emergency situations. [ABSTRACT FROM AUTHOR]