David Bushnell’s 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 hasn’t 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.