IIRC, Janes called them GUPPY III. I have an 06 I got at a yard sale, I'll check in AM. Also, Italians gave them torps as tubes were welded shut and no torps per terms of sale. Not sure which, but between Janes and Conways, I'll get it sorted.
I think the test depth difference came in the Tench kinda late in the class as machinary wasn't up to the 450' max even though the hull could handle it - if nothing else, that warrants a subclass indeed.
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