nuclear submarine [1]
Underwater warship that operates on nuclear energy; it can remain underwater for months without surfacing.
conning tower 
The submarine’s superstructure, from which the periscopes and antennas emerge.
sail plane 
Adjustable fin at the front of the submarine; it is used for diving and surfacing.
diving plane 
Adjustable rudder at the stern that allows the submarine to dive and surface.
upper rudder 
Movable part that allows the submarine to stay on course and turn right and left.
propeller 
Device with blades that is connected to a propeller shaft; its movement generates the propulsion needed to drive the submarine.