<p>I read Douglas C. Waller’s book “Big Red” (sorry, I don’t know how to underline or italicize for you grammar nuts out there) and have seen numerous Military Channel, History Channel, Discovery Channel, etc. shows about submarines and have read that they can identify an individual ship’s signature all the way across the Atlantic. How do such things as the above incident and the USS Greeneville (sunk a Japanese fishing boat) happen?</p>