Preconditions for successful development of the Port of Liepaja and its advantages are advantageous geographical location. Liepaja is one of only three ice-free ports on the eastern coast of the Baltic Sea, which is particularly important in winter months when servicing short sea shipping and line traffic vessels. The Port of Liepaja is built without using natural formations – river delta, cove, lagoon, which would protect the port from wind and wave exposure, therefore it is protected from external forces by a complex system of hydrotechnical protection structures, in which there are three gates that connect the port aquatorium to the open sea. While serving military purposes, when the military service of the USSR had been closed, the port infrastructure was not maintained at a sufficient level and volume, thus part of the port’s hydrotechnical structures are in unsatisfactory or even emergency condition, as well as only two of the three port gates are used for regular ship movements, thus reducing the level of maritime safety when ships enter or depart from the port, as well as moving into the port’s aquarium. As a result, hydrotechnical structures of the Port of Liepaja and their condition have become problematic points, which restrict efficient operation of the trans-European transport network infrastructure. The aim of the project “Renovation of Carosta Canal and Northern Gate Hydrotechnical Constructions” is to improve the level of safety of short sea shipping and to eliminate the restrictions caused by problematic points in the operation of the European transport network infrastructure by implementing restoration and reconstruction of hydrotechnical structures in the Port of Liepaja. Within the framework of the project, the following activities will be implemented:•Renovation of Karosta hydrotechnical protection structures;•Opening of the North Gate for ship movement;• Night lighting of Karosta and the Loch Canal;•Construction of venting devices for the Karosta removable bridge. As a result of the implementation of the project the hydrotechnical structures of the port will be restored or rebuilt, including the reconstruction of two moles, as a result of which the renovated hydrotechnical structures and the opening of the Northern Gate for ship movement will allow to significantly improve maritime safety, as well as the improvement of shipping routes (Carosta and Loch Canals) by installing night lighting and the construction of the Karosta bridge deterrent devices, thus reducing the total losses of maritime traffic participants, i.e. the costs of the Liepaja ship management, which are related to the environmental costs of the EU, which are related to the economy of the Cohesion Fund, which are EUR 4 million, thus reducing the total losses of maritime traffic participants, including the costs of non-contaminating ship management, which is related to the weather of the EU. The total duration of the implementation of the project is 71 month.