Eyewitnesses included British POWs who were part of the forced labor that constructed the camp , and Dr. Stanisław Byczkowski , head of the Department of Toxicology at the Gdańsk School of Medicine .
Eyewitnesses included British POWs who were part of the forced labor that built the camp , and Dr. Stanisław Byczkowski , head of the Department of Toxicology at the Gdańsk School of Medicine .