Underwater warfare refers to combat conducted underwater such as:

• 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, a respective anti-diver defense and also related reconnaissance tasks (see also Commando, Spetznaz, List of special forces).

See also:

• Modern Naval tactics