How did Moshe Peer survive?

Answer 1

He was at Bergen-Belsen, a small concentration camp for fortunate jews with foreign passports, who could be exchanged for German citizens and thus were treated comparably well. Bergen-Belsen had no gas chambers and didn't perform executions, but toward the end of the war an estimated 50 000 people died in the camp both before and after the liberation by the British, due to malnutrition and disease, most notably typhus. Most of the dead would have been moved to the camp from extermination camps in Poland, and thus were in grave condition already when beginning the horrible evacuation marches to Bergen-Belsen, and fell easy prey to all the dangerous diseases haunting the overcrowded camp.