Day 4 describes the brutal arrival at Auschwitz and the transfer to Buna, highlighting the dehumanization prisoners faced. They endured disinfection, tattooing, and clothing changes that stripped them of their identities. Life in the camp was filled with forced labor, starvation, and the constant fear of selection. The psychological toll was immense as prisoners witnessed unimaginable horrors. Despite this, moments of human connection and the fight to hold onto hope remained. The passage contrasts the terror of Auschwitz with the conditions at Buna, showing how survival depended on adapting to the harsh and ever-changing reality of the camps.