Filip Müller, a Slovak Jew deported to Auschwitz in 1942, became one of the most important eyewitnesses of the Holocaust.

At just 20 years old, he was forced into the Sonderkommando—prisoners compelled by the SS to work in the crematoria and gas chambers of Auschwitz-Birkenau. There, Müller witnessed the systematic mass murder of hundreds of thousands of victims, seeing firsthand how the killing process was organised and carried out.

Surrounded by constant brutality, he endured torture, selections, and the ever-present threat of execution. At one point, he even chose to die alongside fellow prisoners in the gas chamber, only to be pulled back at the last moment and urged to survive—to tell the world what happened.

Müller survived Auschwitz, the death marches, and later imprisonment in Mauthausen, until liberation in 1945.

After the war, he testified against Nazi perpetrators and helped expose the truth about Auschwitz. His memoir Eyewitness Auschwitz remains one of the most powerful accounts of the Holocaust ever written.

This is the story of survival, testimony, and the duty to remember.