What a strange title for an article. It&#x27;s like back-to-front thinking.<p>Surely someone uninformed on the topic would want to read something along the lines of &quot;anti-submarine warfare&quot; or even &quot;submarine detection&quot;, during the course of which would probably learn about magnetic anomaly detection and attempts to defeat it.<p>I mean, who and how would someone know (or want to know) why submarines are demagnetized without already knowing something about ASW?