Changes

==History==

==History==

The first submarine to successfully sink a ship was the Confederate vessel [[CSS Hunley|CSS ''Hunley'']] which sank the USS ''Housatonic'' during the [[American Civil War]] on 17 February 1864 in Charleston Harbour.  The ''Hunley'' never returned from the mission, sinking with the loss of all crew.  It has recently been found and recovered.

The first submarine to successfully sink a ship was the Confederate vessel [[CSS H.L. Hunley|CSS ''Hunley'']] which sank the USS ''Housatonic'' during the [[American Civil War]] on 17 February 1864 in Charleston Harbour.  The ''Hunley'' never returned from the mission, sinking with the loss of all crew.  It has recently been found and recovered.

The first submarine commissioned into the United States Navy was the USS ''Holland''.  She was commissioned on Columbus Day in 1900 and was subsequently designated SS 1.   

The first submarine commissioned into the United States Navy was the USS ''Holland''.  She was commissioned on Columbus Day in 1900 and was subsequently designated SS 1.   

Submarines played a significant role in both World Wars I and II, and to this day many nations have submarine fleets, varying from the large, highly trained nuclear fleets of the United States and the United Kingdom, to countries owning one Kilo class diesel submarine.

Submarines played a significant role in both World Wars I and II, and to this day many nations have submarine fleets, varying from the large, highly trained nuclear fleets of the United States and the United Kingdom, to countries owning one Kilo class diesel submarine.

 

==Power sources==

==Power sources==

Various different power sources have been used on submarines over the years.  The ''Hunley'' was powered by its crew turning a crank which was connected to the propeller.  [[Gasoline|Petrol]] engines have also been used, but they gave way to [[diesel engine]]s.  The petrol or diesel engine drives a [[generator]], which charges a [[Battery (electrical)|battery]], and the battery supplies an [[electric motor]] which propels the submarine.  The petrol or diesel engine can only be run when the submarine is on the surface, to recharge the battery.  

Various different power sources have been used on submarines over the years.  The ''Hunley'' was powered by its crew turning a crank which was connected to the propeller.  [[Gasoline|Petrol]] engines have also been used, but they gave way to [[diesel engine]]s.  The petrol or diesel engine drives a [[generator]], which charges a [[Battery (electrical)|battery]], and the battery supplies an [[electric motor]] which propels the submarine.  The petrol or diesel engine can only be run when the submarine is on the surface, to recharge the battery.