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Monitoring activity beneath the ocean surface remains one of the most complex challenges in maritime operations. Traditional sonar systems provide valuable acoustic data, but certain threats and infrastructure anomalies can be difficult to detect using sound alone. As naval missions expand to include protection of subsea cables, pipelines and offshore assets, demand is growing for complementary sensing technologies that can operate quietly and with high precision.
An upgraded passive electromagnetic sensing system known as Listen is designed to address that need. The platform builds on an earlier solution and refines its ability to detect and map submerged objects by measuring variations in electric fields underwater. By capturing detailed 3D electromagnetic data, the system provides a clearer picture of what lies below the surface without emitting signals that could reveal its presence.
The enhanced version integrates eight electrical sensors directly into the hull of an autonomous underwater vehicle (AUV). This internal configuration avoids external protrusions that might disrupt hydrodynamics or risk damage during launch and recovery. The system can operate at depths of up to 6,000 meters and is engineered to function without physical contact with surrounding structures, reducing measurement noise during inspections.
According to NextGenDefense, data collected by the sensors is processed through a digital ecosystem that converts raw electromagnetic readings into visual and analytical outputs. This allows operators to translate complex subsea signatures into actionable intelligence more quickly. Built-in redundancy and noise suppression are intended to maintain consistent performance even in challenging underwater environments.
Designed for flexibility, the sensing package can be deployed on various platforms, including AUVs and remotely operated vehicles. This modularity supports a wide range of missions, from infrastructure inspection to broader maritime surveillance.
From a defense perspective, passive electromagnetic sensing offers an additional layer of situational awareness. It can assist in identifying submerged objects, monitoring critical undersea infrastructure and supporting anti-submarine operations by complementing acoustic systems. Because the technology operates passively, it reduces the risk of detection during sensitive missions.
The upgraded system is scheduled for public debut at an upcoming maritime exhibition, where further details on operational integration are expected to be presented.
