Think about what happened to the USS Grunion. Although there are various questions still unanswered about it, the certainties are that she was hit by a single shell from a japanese merchant while submerged and was never seen again.
http://en.wikipedia.org/wiki/USS_Grunion
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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