 The third contains the 24 kilowatt seawater battery which uses silver chloride and magnesium electrodes with seawater acting as the electrolyte.Finally is the propulsion section which houses the electric motor, four rectangular control fins and two contra-rotating propellers.The vacuum tube-based guidance system is more sophisticated than earlier torpedoes, using pre-launch settings enabling an initial search depth of 50, 150, 250, 450, 650 or 900 feet as well as a search floor at 150, 250, 450, 650 or 900 feet as well as a maximum dive/climb angle of 4.5, 6 or 7 degrees.