Abstract: A submergible cleaning system (1) for cleaning an underwater hull surface (3) of a vessel while the vessel is afloat or an offshore facility, the cleaning system (1) comprising a housing (2) comprising a top face (3) and side faces (4) having edges (5) and an open bottom face, the edges (5) and bottom face being arranged opposite the hull surface (3), and the further comprising a rotary disc (6) having a plurality of nozzles (7) arranged around a periphery (30) of the rotary disc, the nozzles facing the hull surface (3), rolling spacing devices (8) for providing a predetermined first gap (9) between the rotary disc (6) and the hull surface (3), a suction device (10) fluidly connected to an outlet (11) arranged in the housing (2) for providing a negative pressure within the housing (2), a pressurising device (12) fluidly connected with the nozzles (7) for providing a high pressure fluid to the nozzles (7), whereby the nozzles (7) are adapted for discharging fluid under high pressure against the hull surface (3