Not quite the same, but immediately after the war a number of prominent German scientists were interned at Farm Hall, in England, and secretly recorded for months. The full transcripts are available (https://books.google.com/books?id=pzNjntMMq-oC) and it's interesting to hear what Heisenberg and Otto Hahn thought of the Nazis and the successful American nuclear bomb. The transcripts were also adapted into a pretty good stage play a few years back.