A torpedo guidance method using sound waves emitted by a target to determine its location and trajectory.

A guided bomb is a munition that uses a guidance system to modify its flight path in real-time to ensure accuracy.

Ship-launched: a torpedo designed to be deployed from surface warships using onboard launch tubes or deck-mounted launchers.

A watercraft capable of independent operation underwater, primarily used for naval warfare, research, or exploration.

Designation for intercontinental ballistic missiles (ICBMs) deployed and launched from submerged submarines.