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In 1945, 20-year-old Anthony Acevedo was held in captivity with other American soldiers inside a Nazi concentration camp called Berga. There, the soldiers were used as slave laborers, building tunnels for underground fuel factories. It was during this time that the Mexican-American medic kept a secret diary and documented the horrors he witnessed inside the camp.

Acevedo held on to his war diary until 2010, when he donated it to the United States Holocaust Memorial Museum (USHMM) in Washington, D.C. That same year, he registered as a Holocaust survivor with the museum\u2014the first and only Mexican-American to do so.

This episode originally aired in May 2018.