A submarine is a watercraft capable of moving independently of the water surface. Since they can move from the depths of the water they took the name of the submarine. In a broader sense, the meaning of the submarine is the ship with a large crew. These ships have autonomous areas of movement. These ships are used in naval battles to ensure the internal security of the sea. Submarines, which will be able to advance to the desired depth of water, find their directions with the help of a compass.

 Submarine ships are designed in the form of two nested boats. It must be in constant motion to remain at the desired depth. There are special air tanks in the compartment prepared for the crew to stay. Originally designed to explore the depths of the sea, submarine ships are being used as warships thanks to developing the technology.