Non acoustic Detection - how does this work

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    Non acoustic Detection - how does this work

    Hi everyone, a quick question-

    I was cruising fas.org when I saw an article about the russian "Sierra" class. The article said that the sub's nonacoustic detection equipment was better than a LA class boat....


    What is nonacoustic detection equipment? Does it have the same range as normal sonar? Why doesnt the US develop this technology also?
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