Apparatus for loading a dry powdered electrolyte

An apparatus (1) for loading a powdered electrolyte into a chamber (2) made in a tubular casing (4) of a craft operating in an underwater environment, comprising: a valve (5) carried by the tubular casing (4), configured to be arranged in a normally closed position and designed to be moved, as a result of manual operation, to an open position to allow the introduction of the powdered electrolyte into the chamber (2) from outside the casing (4); a feeder-actuator assembly (7) configured to be mounted on the tubular casing (4) to couple with the valve (5) in a fluid-tight manner and enable the opening/closing of the valve (5); and an electrolyte tank (8) configured to couple with the feeder-actuator assembly (7) and feed powdered electrolyte by gravity to the actuator assembly (7). The actuator assembly (7) delimits an elongated internal cavity configured to allow a flow of powdered electrolyte from the tank (8) to the chamber (2) through the valve (5).