[3] The inmates were forced to work under grueling conditions in various locations across northern Germany; often transported between subcamps and specific job sites.
Due to subsequent demolition of the Neuengamme camp system by the SS in 1945 including its records, the historical work is difficult and still incomplete.
[4] For example, in 1967, the German Federal Ministry of Justice suggested that the camp operated from 1 September 1938 until 5 May 1945 and became part of the Sachsenhausen in June 1940.
Using the political division of Germany of the year 2000, there were at least 34 subcamps in Lower Saxony, 9 in Bremen, 9 in Schleswig-Holstein, 6 in North Rhine-Westphalia, 5 in Mecklenburg-Western Pomerania, 3 in Saxony-Anhalt, and 1 in Brandenburg.
Inmates of concentration camps were centralized in construction labor brigades (German:Baubrigaden), organized by the SS, to clean up after air raids, remove unexploded ordnance devices and bombs, or recover corpses.