The documentary details the largest covert spy operation of World War II, during which British intelligence hid microphones in internment facilities to eavesdrop on captured Nazi prisoners of war (POWs). Unaware that they were being monitored, the prisoners spoke candidly and freely about their direct involvement in the Holocaust, providing unfiltered accounts that had never before been made public. | The documentary details the largest covert spy operation of World War II, during which British intelligence hid microphones in internment facilities to eavesdrop on captured Nazi prisoners of war (POWs). Unaware that they were being monitored, the prisoners spoke candidly and freely about their direct involvement in the Holocaust, providing unfiltered accounts that had never before been made public. |