PRESENTATION OUTLINE
Submarines is a watercraft that is used for operations underwater.
Submarines were first widely used in WW1. Mainly used as a war vessel
Now, submarines are mainly used for attacking enemy ships, aircraft protection, ballistic missile submarines, and etc.
Most subs have a cylindrical body and ends with a vertical structure.
Some famous types of submarines are the Type VII submarine, Los Angeles -class submarine, Vanguard-class submarine, I-400-class submarine, and Oscar-class submarine.
