Because prisoners were forced to clear the site at the end of the war, only 10% of original documentation survives from the period. From this evidence, scholars have been able to conclusively prove exact numbers for some months of the entire 1938-1945 period. It is known exactly that by the end of 1940, 2,900 were imprisoned at Neuengamme and the known death toll was over 432. In 1941, the prisoners completed the barracks, and transports arrived from Auschwitz carrying 1002 prisoners as well as various other transports carrying 1000 Soviet POWs. The total number of prisoners grew to 4500. 495 known deaths occurred in 1941 alone.