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Jan 1, 1578
First drawing of the submarine
http://inventors.about.com/od/sstartinventions/a/Submarines_2.htm Not until 1578 did any record appear of a craft designed for underwater navigation. William Bourne, a former Royal Navy gunner, designed a completely enclosed boat that could be submerged and rowed beneath the surface. -
Advancement of the submarine
http://inventors.about.com/od/sstartinventions/a/Submarines_2.htm
What might be called the first "practical" submarine was a rowboat covered with greased leather. It was the idea of Cornelius Van Drebbel, a Dutch doctor living in England, in 1620. -
Another advancement of the submarine
http://www.submarine-history.com/NOVAone.htm
French priest Marin Mersenne theorized that a submarine should be made of copper, cylindrical in shape to better withstand pressure and with pointed ends both for streamlining and to permit reversing course without having to turn around. -
Today's submarines
http://en.wikipedia.org/wiki/Submarine
A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term submarine most commonly refers to a large crewed autonomous vessel. However, historically or colloquially, submarine can also refer to medium-sized or smaller vessels (midget submarines, wet subs), remotely operated vehicles or robots.
