OVERVIEW: The Mk104 is a helicopter-towed acoustic influence mine sweep system designed to detonate acoustic-triggered naval mines. It simulates ship-like acoustic signatures to safely clear mined waters without risking manned surface vessels.

DETAILS: The Mk104 consists of an underwater acoustic generator towed at controlled depth behind helicopters such as the MH-53E Sea Dragon. It emits low-frequency sounds that mimic the machinery and propulsion signatures of large naval vessels, triggering acoustic mines. Adapted from earlier surface ship systems, the Mk104 was integrated into the airborne mine countermeasure (AMCM) role with the introduction of the MH-53E in the early 1980s. It is typically used in conjunction with the Mk103 mechanical cutter and Mk105 magnetic influence sweeps as part of layered mine-clearing operations. Its role is to neutralize mines that respond to acoustic cues without requiring explosive contact. The system enables standoff clearance of mined areas for naval operations.

FUNCTION: When towed at operational speed and depth, the Mk104 emits controlled acoustic signals that replicate ship noises, causing influence mines to detonate at a safe distance from friendly forces. It is employed to clear paths for amphibious, surface, and logistic vessels through mined waters.

NOTE:
IOC: Early 1970s
Operators: United States Navy
Platforms: MH-53E Sea Dragon
Conflict used in: Operational mine clearance and training missions; no confirmed combat use

SOURCE: US Navy Mine Warfare Manual ; Naval Air Systems Command publications ; GlobalSecurity.org AMCM overview ; Designation-Systems.net Mk104 entry