How do Submarines manage to Submerge and Resurface?

Understand the Physics behind how submarines work!
A submarine or submersible is nothing more than a closed vessel designed to navigate below the surface of the water. But, such a vessel requires a variety of essential components and systems in order to function. Learning how each component works is essential to understanding how a submarine operates.
A submarine's hull is an essential factor when considering how submarines work. The hull is the primary layer that protects the crew by preventing external water pressure from entering.
Watch the video and understand how submarines work!!!!