What happened to Jews that didn't voluntarily turn themselves into the concentration camps?

Answer 1

They died. The able-bodied workers were separated from those who were too young, old or sick to work. Those who were deemed unfit for the labor camp were sent to the "showers," which was really a gas chamber.

The German soldiers then forced the healthy Jews to cremate the bodies in large furnaces or dumped them into mass graves.

The workers were worked hard, fed almost nothing, and provided little in the way of clothing or shelter. They nearly froze in winter because they lacked shoes or coats, and many died of starvation, illness or exhaustion or were sent to the gas chamber because they could no longer work.

Elie Wiesel, a Survivor of the Holocaust, wrote a series of books about his experiences. The first, Night, gives a short (120 pages) but vivid account of life in the German-designated "Jewish ghettos," the loss of his family, and his personal story of being a prisoner at Birkenau. If you want to understand more about the horrors the Jewish people experienced during this dark period in history, I highly recommend reading his work (see Related Links).

Answer 2

Most Jews that didn't turn themselves in were caught hiding and immediately arrested. Also, the people who were hiding them (if anyone) were arrested, too. If they were not caught, they were either very lucky or later punished/killed.

Answer 3

if they were so ill that they had to visit the sanatorium, then they would usually be killed by a lethal injection.