The Cavalla is not a GUPPY, or at least it was supposed to be. In fact, the Cavalla is a modified Gato-class submarine. It was fitted with a snorkel and a bow sonar under the Fleet Snorkel Program that the Army had set up, because they realized they would'nt have enough money to modify all of the desired subs to GUPPY. That's why it has a strange rounded bow.
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Lurking In The Dark...
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