Excerpt:
A submarine is a vessel which has been designed for underwater operations. It has the capability to operate underneath the surface or on the surface of the water. This along with it's armament makes it a vital piece to our nations sea power and sea control.
Evidence of this type of craft goes back into history an estimated 2000 years. Aristotle has described for us a type of submersible chamber that was used in the year 332 B.C. These were used by the sailors of Alexander The Great during the blockade of Tiros in order to put obstacles and some types of charges of unknown kind.