The article deals with the theoretical modeling of the process of destruction of the parasitic air volume inside the ballast tank, which is filled with water. The most important issue in solving the problem of the destruction of a parasitic air bubble inside a ballast tank is the rate of decrease in its volume when it is exposed to destructive air jets under pressure. During theoretical studies, the main emphasis was on obtaining qualitative results that reflect the change in the main operational characteristics of the vessel in waves and those data that describe the behavior of the parasitic air volume in the ship's ballast tank during the process of its movement and decomposition into a number of small air volumes.