Extended dependence on fossil fuels and other consumable resources to meet the energy requirements of the modern world and to provide the high living standards required by modern society; have been driving mankind toward the exhaustion of current fuel and energy resources. Hence, this article provides an infinite energy device that can be used to produce energy constantly by using buoyancy and gravitational force. The infinite energy device comprises a positive buoyant stable vessel body (the vessel is attached to an external tank with bars) having at its base (inside) an extendable/retractable chamber with the lock to open and close the intake valve for incoming water through the valve's hole from the lower end of the vessel. The water exits the chamber via a pipe due to the external pressure from a weight plate. The continuous flow of water from the pipe can be further used to generate energy. This device is not a completely isolated system from the rest of the universe; we do not know the far future so it is not a perpetual motion device and thus does not violate physics principles. I have a working prototype, and I have included as much information as possible about the device so that the experiment can be reproduced. Therefore, I included supporting photos. In layman's terms, this device has the advantage of a sequence of five systems. Lateral water displacement reduces the depth distance to send water above; buoyant force (75.40 kgf) acts as an upward force to expand a chamber of the device's vessel (inside) to store energy in the form of the gravitational potential energy of a weight plate (21.5 kgf). The buoyant force (75.40 kgf) is greater than gravitational force (21.5 kgf) due to which a steady state is reached with a net force equal to 53.9 kgf. Incoming water enters the chamber through an intake valve underneath. This is a float valve system. The valve is used to close by the buoyant force. It is initially locked by hand before automatic locking systems enclose the chamber. The hydraulic lift principle (system) is used to pressurize the chamber via the weight plate (gravity). Pascal's principle and gravity thus bring the chamber water outside the vessel and above the surrounding water level through a pipe. The (falling) water generates electricity in the water turbine generator and distributes electrical energy for the automatic locking of the intake valve and the rest, for our use. This is the main benefit of the device. The objective of the device is to bring the surrounding (chamber) water above water level by using buoyant force and gravity. And, I have demonstrated the prototype.