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One of the three operational areas of naval warfare

Underwater warfare, also known as undersea warfare or subsurface warfare, is naval warfare involving underwater vehicle or combat operations conducted underwater. It is one of the four operational areas of naval warfare, the others being surface warfare, aerial warfare, and information warfare. Underwater warfare includes:
Actions by submarines actions, and anti submarine warfare, i. e. warfare between submarines, other submarines and surface ships; combat airplanes and helicopters may also be engaged when launching special dive bombs and torpedo missiles against submarines;
Underwater special operations, considering:
Military diving sabotage against ships and ports. Anti frogman techniques. Reconnaissance tasks.

In the 20th century underwater warfare was dominated by the submarine. They first came to prevalence during the First World War, when German U boats attacked and sank many allied vessels, such as the sinking of the Lusitania in 1917. A similar scenario occurred during the Second World War, when German U boats launched a prolonged campaign against Allied shipping, especially in the mid Atlantic. Japanese submarines also played a minimal role on the Pacific front, and American submarines sank a total of 5.3 million tons of Axis shipping throughout the war, most of which was scored against the Japanese. In the 21st century unmanned underwater vehicles are coming to play a significant part in underwater 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.