Primarily a research vessel, it also carried out a range of military missions that to this day remain top secret. Veterans who served aboard the tiny sub during the Cold War say that it was one of the most fascinating assignments of their careers — but that not even their wives know all the details.
Read more at http://www.military.com/daily-news/2013/11/13/submarine-its-sailors-maintain-cold-war-secrets.html.
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