Recent advances in commercial tools and technologies now give open-source researchers some ability to monitor submarine fleets. Military ASW employs technologies such as magnetic anomaly detectors (MAD), which detect tiny disturbances to Earth’s magnetic field caused by metallic submarine hulls, passive and active sonar sensors that use sound propagation to detect objects underwater, as well as radar and high-resolution satellite imagery to detect surfaced submarines. Submarine detection and monitoring was traditionally the exclusive domain of highly classified military units specializing in naval anti-submarine warfare (ASW). Nicknamed the “Silent Service,” submarines are considered the most survivable weapons-delivery platform.
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