I used to think it was the Argentine sub, and that might have been useful cover for a more dangerous sub (higher capability in all respects).
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What I meant to say is I used to think it was the Argentine sub but now that FReepers have provided more information about it, I think the “disappearance” of that sub might have been useful cover for a more dangerous sub (higher capability in all respects).
I’ll add that one of the intel videos I watched (Shipman, former CIA ?) said the CIA has it’s own equipment (planes, boats etc.) and weapons cached all over the world. Maybe they took some of those trillions of dollars that Obama et. al. swiped and simply placed an order for their own sub with all the bells and whistles they wanted.
I think your alternate sub theory is very likely the truth.