Submarine propulsion system enabling underwater operation without atmospheric oxygen, typically using stored oxidizer or closed-cycle engines.

Anechoic coating: A type of sonar-absorbing material applied to submarines to reduce their acoustic signature. It consists of rubber or other materials with properties that minimize sound reflection.

Anti-ship missiles are guided missiles designed to engage and destroy naval vessels. They are typically used by aircraft, ships, or submarines to attack enemy ships.

Propulsion system combining diesel engines to generate electricity, which powers electric motors driving the vessel's propellers.

Laying explosive mines underwater from a submarine.