A ship breaking down arrangement (1) comprising,—two waterborne platforms (10, 20) having at least one removing means (60) for removing dismantled parts and/or fluids from a ship (40) which shall be broken;—a midsection (30) placed between and connected to said platforms lifting means provided on the platforms for lifting and lowering the ship between said platforms; and—at least one transporting means (90) for receiving and transporting said dismantled parts and/or fluids to a receiving location, wherein breaking down is performed while the ship is still located at sea. The application also relates to a method for breaking down ships.