Anti-submarine warfare
Anti-submarine warfare comprises military operations and technologies used to detect, track, deter, or destroy submarines.
Sonar: A system that detects and locates objects by transmitting or receiving sound waves in water or air. Active and passive sonar reveal submarines through echoes or sounds they emit.
Submarine: A watercraft capable of operating underwater, often using concealment to conduct military or civilian missions. Submarines are the targets whose stealth and capabilities shape anti-submarine methods.
Anti-submarine warfare in World War I: Naval efforts during World War I to counter German submarines, especially those attacking merchant shipping. Convoying, depth charges, and early hydrophones emerged in response to U-boat attacks.
Anti-submarine warfare helicopter: A helicopter equipped to search for and attack submarines, often using dipping sonar and torpedoes. Its hovering sensor can investigate contacts beyond a surface ship’s immediate reach.
Submarine stealth: The reduction of a submarine’s detectability through acoustic, magnetic, visual, and other signatures. Stealth directly challenges the sensors and search patterns used in anti-submarine operations.
Sonobuoy: A buoyant expendable sensor deployed from aircraft to detect underwater sound and transmit data by radio. Sonobuoys let aircraft build temporary acoustic sensor fields over suspected submarine routes.
Underwater acoustics: The study of how sound is generated and propagates in water. Sound propagation determines how far sonar can detect a submarine and how conditions alter the signal.
Convoy: A group of merchant or military ships traveling together under naval protection. Convoys reduced the vulnerability of shipping to submarines and concentrated defensive forces.
Frigate: A warship used for escort, patrol, and fleet duties, commonly equipped for submarine detection. Frigates often protect naval formations and shipping from submarine threats.
Strategic deterrence: The prevention of hostile action by threatening consequences that would outweigh its expected gains. Nuclear submarines make detection and attack inseparable from the risks of escalation.