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One of the main objectives of the present document is to develop a fast and stable plus reasonably accurate method of numerical simulation in order to revisit and predict the flooding scenarios. The author, Henrin Dankowski, has performed a good professional comparison with the results obtained in the course of the standard benchmark tests and repeated investigation of three accidents, namely the Estonia, the Heraklion and the European Gateway, for validation purpose. The aim of the method presented in this volume was to fill the gap that exists there between relatively simple evaluations of ship stability and more complex and time consuming methods of simulation of the seakeeping. Subject method has been implemented in the software environment E4 specifically developed for ship design. Subject environment is providing users with the direct access to the complete vessel data model and to the computational algorithms that have already been implemented. Calculations of the damage stability of a vessel at early stages of the design are considered essential indication of the vessel's safety level to withstanding the water ingress. Several accidents that have occurred in the past are demonstrating how important it is to consider the intermediate stages of flooding process and not only looking at the resulting final stage.