How does a submarine work?

Explanation

a submarine can float because the weight of the water that it displaces is equal to the weight of the ship. This means the pressure of the submarine pressing down on the water is the same as the pressure of the water pushing up on the ship.

This phenomenon is called buoyant force. Buoyant force works the same way on a submarine. In order to control buoyancy, the submarine relies on special tanks that can be filled with water or air. To return to the surface, the tanks are filled with air. This makes the submarine less dense than the water around it, causing the sub to float to the surface.