Rudolf Vrba escaped Auschwitz in 1944 and co-authored a detailed report on the camp with fellow escapee Alfred Wetzler.
Vrba and Wetzler escaped from Auschwitz on 7 April 1944 by hiding in a wood pile outside the camp’s inner perimeter. After reaching Slovakia, they described the camp’s killing facilities, deportation process, and planned fate of Hungarian Jews. Their testimony became known as the Vrba–Wetzler report.
The report was distributed to Jewish and Allied officials and formed part of the wider Auschwitz Protocols. It did not immediately stop the deportations, but it helped expose the extermination process internationally. Vrba later became a biochemist and published his memoir, I Escaped from Auschwitz, in 1963.