What happens in Buna in the book Night by Elie Wiesel?

In the book "Night" by Elie Wiesel, Buna is a labor camp within Auschwitz where Elie and his father are sent. While at Buna, Elie and the other prisoners suffer extreme hardships, including starvation, harsh working conditions, and cruelty at the hands of the Nazis. Elie witnesses the dehumanization of the prisoners and struggles to maintain his own humanity in the face of such brutality.