US Patent 10990144 Systems and methods for buoyancy-assisted immersion server maintenance

A system may include a tank configured to hold a dielectric liquid, a rack located within the tank and having a plurality of bays, each bay configured to receive a corresponding device, an air pump configured to drive an air flow, at least one variable-buoyancy chamber mechanically coupled to at least one of the tank and the rack, each of the at least one variable-buoyancy chamber comprising a fluidically-sealed plenum and wherein the at least one variable-buoyancy chamber is configured to mechanically couple to a device-in-service, and a control subsystem configured to control a buoyancy of the at least one variable-buoyancy chamber in order to cause movement of the device-in-service relative to the rack.