This story would make a great film.

Secrets of the Dead » Escape from Auschwitz | PBS

The death factory at Auschwitz was a closely guarded secret of the
Third Reich - until two men, Rudolph Vrba and Alfred Wetzler, escaped
to tell the world about the Nazi atrocities. Escape from Auschwitz
reveals the story of their escape and explores the controversial
decision by the head of the Hungarian underground not to make their
report public.