Britannica Sources used in this answer

How do torpedoes allow submarines to attack ships underwater?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Torpedoes are self-propelled, cigar-shaped underwater missiles that serve as the primary weapon for submarines to engage surface ships and other submarines.12

These weapons allow for underwater attacks through several key mechanisms:

  • Propulsion and Guidance: Modern torpedoes are typically powered by battery-operated electric motors. They utilize sophisticated internal systems, such as gyroscopes, to maintain a set course and depth.1
  • Targeting: To strike a target, torpedoes use advanced acoustic systems. Active-acoustic torpedoes emit sound signals and home in on the resulting echoes, while passive-acoustic torpedoes track the noise generated by the target vessel.1
  • Detonation: Once a torpedo reaches its target, it is designed to explode upon contact with the hull or when it comes into close proximity, triggering an explosive-filled warhead.1

By enabling submarines to launch attacks from beneath the surface, torpedoes have historically been a decisive factor in naval warfare, particularly during the world wars.12