nuclear submarine 
Underwater warship that operates on nuclear energy; it can remain underwater for months without surfacing.
The submarine’s superstructure, from which the periscopes and antennas emerge.
Adjustable fin at the front of the submarine; it is used for diving and surfacing.
Adjustable rudder at the stern that allows the submarine to dive and surface.
Movable part that allows the submarine to stay on course and turn right and left.
Device with blades that is connected to a propeller shaft; its movement generates the propulsion needed to drive the submarine.