Detailed is a device for cleaning an immersed surface including a body; members for driving the body; a filtration chamber which has: a liquid inlet and a liquid outlet; a filtering device which is removably mounted in the filtration chamber; a hydraulic circuit for the flow of liquid between the inlet and the outlet through the filtering device; an axial pumping propeller which is interposed in the hydraulic circuit; a flap for access to the filtering device, wherein the pumping propeller is orientated in order to generate a liquid flow with a horizontal component towards the rear, the outlet being opposite the propeller; the pumping motor is arranged below the hydraulic circuit; the access flap is arranged at the top and/or towards the front of the hydraulic circuit in order to allow the filtering device to be disassembled via the top and/or towards the front.