FIELD: development of ocean; submersible vehicles with varying buoyancy. SUBSTANCE: when working medium is heated, pressure is built up setting punch in motion and forming area of reduced pressure under punch simultaneously transferring liquid from under-punch space to gas hydraulic accumulator. When valve opens, oil from bellows located on the outside of pressure hull flows to area of reduced pressure; as a result, bellows is compressed reducing integral volume of vehicle and making it submerge. At depth, working medium is cooled tending to compression. When valve opens, compressed gas in gas hydraulic accumulator forces oil to bellows through punch increasing volume of bellows and making vehicle rise. Range of punch motion is regulated through transfer of oil via tubes provided with controllable valves from bellows and working medium space to gas hydraulic accumulator. EFFECT: extended range of depths and temperature variation. 4 cl, 1 dwg
