Abstract: The invention relates to the method and device for transforming mechanical stress power into electric power and may be used to create an additional power supply source for the power supply system of a submarine vessel. Proposed system for electric power generation comprises a basis, piezoelectric transformers mounted on the said basis and means for mechanical load application on the transformers, where the piezoelectric transformers are provided on the structural elements of the submarine vessel, which elements are not rigidly connected to the hull of the submarine vessel and have an operative position, where the interaction with the hull of submarine vessel is possible, so that seawater pressure is propagated to the piezoelectric transformers through the hull of submarine vessel in case of the change in submersion depth of the said vessel.

Abstract: An autonomous system for blowing ballast for eliminating negative buoyancy of a submarine and a method of blowing the same. The autonomous system includes air supply balloons arranged in an area of the submarine protected from mechanical damage; trunk pipelines connected to the balloons for supplying gas to FDT of the submarine; shutoff devices for regulating the supply of gas via the trunk pipelines. According to the method realized using the disclosed system, compressed gas is supplied from the compressed air balloon, over the trunk pipelines, and into the FDT of the submarine. The invention provides bringing the negative buoyancy of the submarine to zero to stop the gravitational dive.