I recently watched a documentary on the Marianas Trench and took special note to the crushing capacity of the water pressure at up to 11km creating 16,000 psi of pressure. Being an avid mechanic, i work with today's combustion engine which can generate about 600psi in each cylinder, using the power in multiple cylinders to turn the crank. I have also worked with many spring operated mechanism when taking apart everything i see. I am beginning to try and build a prototype engine who's cylinders are driven by water pressure, ballast and spring, any and all input would be greatly appreciated. Equipment needed list: * Battery1(will start with 0 charge) for receiving power from the engine, to be measure of success - surface * Battery2(charged, used by the compressor when direct solar power < req) - surface * anchor line from floor to the surface * engine cylinder - anchor line runs through center of the engine platform * spring - rated to Xatm connected to engine cylinder, maintains full open at Xatm * mechanism to measure ATMs connected to engine * ballast tank - attached to engine * compressed air tank - attached/connected to the ballast tank * underwater air compressor - attached/connected to the compressed air tank - air line (strong structure req.)- connects underwater air compressor to the surface - solar panel n line- connects underwater air compressor via power line the to surface The concept being that the following actions would allow the engine to support its own function. * engine underwater with ballast empty and spring under min load, will maintain depth generating Xatm - State: cylinder open, triggers the ballast tanks to open * ballast tank is filled and reaches depth generating Xatm - State: cylinder closed * battery receives the energy created by the cylinder moving from open to closed * max atm measurement triggers compressed air tank to release into the ballast, expelling the water and raising the engine. * the spring then resets the cylinder to its original position, starting the cycle all over again. - the compressed air tank must be matched with the compressor to ensure the engine rises steadily back to the surface.(I think i can capture and use the air pressure lost by the ballast filling too somehow?) - The solar panel must be able to run the air compressor as the engine is rising and charge Battery 2 while the engine is not rising. (recommendations appreciated) Any thoughts and comments on the feasibility and possible issues to foresee would be greatly appreciated!