From a bureaucratic perspective, this report required no elaboration. In 1959, however, a German eyewitness, Fritz Höfer, who had been a truck driver in Sonderkommando 4a, had more to say. Höfer detailed how the Germans, aided and abetted by their Ukrainian collaborators, rounded up the Jews and forced them to strip, leave their valuables behind, and enter "a ravine that was about 150 meters long, 30 meters wide, and a good 15 meters deep." He said that "no distinction was made between men, women, and children." Once in the ravine, the Jews were "made to lie down on top of Jews who had already been shot. This all happened very quickly. The corpses were literally in layers. A police marksman came along and shot each Jew in the neck with a submachine gun at the spot where he was lying." Until it was too late, said Höfer, the Jews approached Babi Yar "still under the impression that they were being resettled.