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ships after a long time operating at sea their underwater bottom will be invaded by seaweed and other marine microorganisms they attach to the hull propellers and many underwater parts of the ship reducing the shipamp;#39;s performance most notably reducing the speed increasing the cost of oil fuel to operate the ship ing to many statistics the speed loss is 30 percent of the rated speed so the fuel oil consumption increases ingly regular underwater cleaning of the vessel makes it possible to restore the original speed by about 95 to 98 and reduce the cost of fuel oil which as a rule accounts for almost half of the operating costs another important part that should also be cleaned and polished are other propellers because this will help reduce the damage that damages the surface of the propellers and helps improve their performance therefore ship owners regularly plan to clean the hull and many underwater parts for ships ingly hull cleaning is understood as the process