Have you read Priestblock 25487, by Jean Bernard? It's a memoir of a priest, Jean Bernard, in Dachau. The horrors of the concentration weren't only perpetrated on the Jews. Anti-Nazi Catholics were persecuted, also, in particular, priests. In watching this video of priests praying in Dachau, I couldn't help but think of Fr. Bernard. Look at the faces in prayer. Watch the fingers praying the Rosary.