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Underwater warfare is one of the three operational areas of naval warfare, the others being surface warfare and aerial warfare. It refers to combat conducted underwater such as:
Underwater warfare may also be referred to as undersea warfare or subsurface warfare.
In the 20th century underwater warfare was dominated by the submarine. In the 21st century unmanned underwater vehicles are coming to play a significant part in underwater warfare.
Main article: Seabed warfare
Seabed warfare is defined as “operations to, from and across the ocean floor.” In general the target of seabed warfare is infrastructure in place on the seabed such as power cables, telecom cables, or natural resource extraction systems.