Submarine detection systems are an aspect of antisubmarine warfare.
They break down into two broad categories; acoustic and non-acoustic.
Non-acoustic systems can work on a variety of different physical principles, including the use of magnetic anomaly detectors[1] and systems such as SOKS, which are believed to work by detecting phenomena such as trace chemicals, heat changes, and radioactivity left in a submarine's wake.
[2][3] There is evidence that some Royal Navy submarines are fitted with wake-detection systems.
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