100s of Nazi submarines were never found.
Do you mean "the USA and UK sank 100s of Nazi submarines attacking convoys and never bothered to look for them" or "100s of Nazi submarines cruised out of port and no one has any idea what happened to them"?
Shhhhhh! shhhhh! don't think..... no no no no.... just believe !
There's certainly an argument to be made that U-530 and U-977 were up to something in the vicinity of Argentina. The trip was extraordinarily hazardous (the Atlantic was crawling with Allied ASW assets), no one in their right mind believed Goebbels's propaganda broadcasts, and the German Kriegsmarine knew that surrendering to the USA/UK was a pretty good deal compared to either the Russians or risking an Atlantic crossing. The crews also knew that Donnitz had ordered them to surrender, ergo they were now unlawful combatants and could be sunk on sight like pirates. It's particularly telling how long it took them to surrender - on the order of a month or two longer than the trip would take. Particularly given the unanimous Sgt Schultz "I know nothing" routine in regard to the missing ships' logs.
That being said, it's a good argument for "the subs swapped out the deck gun for a dinghy, dropped off some Nazi officers with valuables, killed time for a month or two to let the trail go cold, and then surrendered". It's not a good argument for "Nazi Antartic base!!!1!!" Much the same as your husband showing up two hours late smelling of booze is a good argument for him stopping for a pint, but not for him building an entire bar.
There is 90+ unaccounted for subs. Who knows
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