OVERVIEW: The Bottom Acoustic Broad-Band Mine is a seabed-deployed naval mine designed to detonate when exposed to a wide range of underwater acoustic signatures. It passively detects vessel noise and triggers detonation without requiring direct contact.

DETAILS: This type of mine rests on the ocean floor and contains a broad-band hydrophone array to sense acoustic energy across multiple frequency bands typical of ship propellers and engines. Upon detecting acoustic levels exceeding set thresholds, its electronic fuze initiates detonation. Developed during the mid-20th century, it represents a significant advancement from early contact and single-effect mines. The design provides improved discrimination and reduced risk of accidental activation from marine life or unrelated noise.

FUNCTION: Once emplaced, the mine remains dormant while continuously monitoring underwater sound. When its broad-band sensors detect vessel-generated acoustic signals above preconfigured thresholds, the fuze activates the explosive charge to destroy or disable passing ships.

NOTE:
IOC: 1960s
Operators: United States, Soviet Union, China
Platforms: Deployed by minelayers, submarines, helicopters, or aircraft
Conflict used in: Cold War naval exercises; no widely confirmed combat use

SOURCE: U.S. Navy Mine Warfare Manual; Jane’s Underwater Warfare Systems; Federation of American Scientists (FAS) Mine Data Sheets; GlobalSecurity.org naval mine profiles