OVERVIEW: The Aerial Depth Charge is an unguided, air-delivered anti-submarine weapon designed to detonate underwater and destroy or damage submerged submarines. It is deployed by fixed-wing aircraft or helicopters and relies on preset depth fuzing for underwater activation.

DETAILS: First developed during World War II and extensively used through the Cold War, aerial depth charges are cylindrical munitions dropped from aircraft to counter hostile submarines by detonating at specific underwater depths. They use hydrostatic, time-delay, or proximity fuzes to initiate detonation below the surface, creating a shockwave to damage submarine hulls. These weapons evolved from basic high-explosive charges to more sophisticated models with larger warheads, increased sinking speeds, and better delivery accuracy. Aerial depth charges were primarily used by maritime patrol aircraft and anti-submarine helicopters.

The term "depth charge" refers to its functional role detonating at a calculated depth to attack submerged targets. Aerial variants are designed with aerodynamic tail fins or parachutes to stabilize descent from aircraft. They may be either free-fall or retarded for low-altitude delivery.

FUNCTION: After release from the aircraft, the depth charge descends into the water and detonates at a preset depth, producing an intense pressure wave. This shockwave can cause lethal hull damage or system failure in submarines within the blast radius.

NOTE:
IOC: 1916 (first naval depth charge), 1942 (first aerial depth charge in widespread use)
Operators: United States, United Kingdom, Soviet Union, Germany, France, Japan, China, India, others
Platforms: PBY Catalina, Avro Shackleton, Tu-142, P-3 Orion, Il-38, S-2 Tracker, Nimrod MR.2, SH-3 Sea King, Ka-25PL
Conflict used in: World War II (1942–1945), Korean War (1950–1953), Cold War patrols (1947–1991), Falklands War (1982)

SOURCE:
U.S. Navy Historic Center ; Federation of American Scientists (FAS): https://fas.org/man/dod-101/sys/ship/weaps/depth.htm ; National Museum of the U.S. Air Force: https://www.nationalmuseum.af.mil ; Russian Ministry of Defense Archives ; Jane’s Weapons: Air-Launched ; Naval Weapons of World War Two, John Campbell