||The first known submarine to be built was made by a
Dutch inventor Cornelius Drebbel in or around 1620. However, the first successes were by
the Americans during the American Revolution. One such person was David Bushnell in 1776.David Bushnells one man submarine had two hand-cranked screw
propellers, a hand-operated control lever connected to the rudder, foot operated pumps to
let water in or send it out and a crudely-lit control panel.
In the 1860s and 1870s the development of iron and
steel provided materials that could be made watertight and the torpedo appeared. But the
trials of using steam, oxygen, compressed air and paraffin engines all failed. The design
made by Dupuy de Lome and Gustave Zede provided a basis for development by using electric
motors driven by batteries.
As time pass, the submarine has developed dramatically, and
now it can submerge to a great depth, carrying destructive weapons (including long range
nuclear missiles) and stay under water for long periods of time.
The invention of the submarine hasnt had much
influence in our lives. However, it has changed the lives of the military. Ever since the
First World War, submarine has been used for military purposes and it is still the same
today. Although submarines tend to be slightly slow and have obvious maneuverability and
safety problems, they are a good machine for gathering intelligence.