Patent ID: 7987674

Claim:
A submersible vehicle adapted to descend or ascend to different depths within water or ocean, the submersible vehicle comprising an energy producing device, the energy product device comprising: a temperature-responsive material adapted to undergo density changes in response to temperature changes; a hydraulic fluid operatively associated with the temperature-responsive material, the hydraulic fluid adapted to be controlled within the energy producing device in accordance with the density changes of the temperature-responsive material; a first pressurized storage compartment configured to store the hydraulic fluid upon the density change of the temperature-responsive material; a hydraulic motor fluidically connected with the first pressurized storage compartment; a first valve adapted to allow hydraulic fluid passage from the first pressurized storage compartment to the hydraulic motor; an energy storage component connected with the hydraulic motor, the energy storage component being chargeable by the hydraulic motor upon passage of the hydraulic fluid through the hydraulic motor thus obtaining conversion of hydraulic energy to electrical energy; and a second pressurized storage compartment configured to store the hydraulic fluid after passage of the hydraulic fluid in the hydraulic motor, wherein the electrical energy is adapted to be used to power the submersible vehicle, the submersible vehicle further comprising a bladder external to the submersible vehicle, the bladder being connected to the second pressurized storage compartment, wherein the hydraulic fluid is adapted to be controllably fed to the bladder to control buoyancy of the submersible vehicle.