Submersible Hydraulic Power Units with Interchangeable Manifolds

Submersible hydraulic power units with interchangeable manifolds for hydraulic systems are provided. In one embodiment, submersible hydraulic power unit for connecting to a hydraulic device, the submersible hydraulic power unit comprising: a tank for receiving hydraulic fluid, wherein the tank is configured to house: a motor that is operational when submerged in the hydraulic fluid, the motor having a powered on and a powered off configuration based on at least one command signal; and a pump that is connected to the motor, wherein the pump is operational when submerged in the hydraulic fluid and wherein the motor powers the pump to regulate flow of the hydraulic fluid in and out of the tank; and a lid that attaches to, and detaches from, the tank, wherein the lid comprises at least one opening allowing an interchangeable manifold to connect to the pump.