What were the possibilities of escape for Elie and his family in Night?

By the end of the novel, there is none. A striking blow to their faiths were the pipel's hanging and Elie's contemplation of God, combined with the knowledge that had they stayed in the infirmary, they would have survived together. The only hope that came after that was the resistance of the camp uprising. However, that was abrupt and there was a period of hopelessness during the story as Elie is constantly beaten morally and physically.