The "Borkum" and "Helgoland" camps were "volunteer" (Hilfswillige) labour camps and the labourers in those camps were treated harshly but a little bit better than the inmates at the "Sylt" and "Norderney" camps. The prisoners in "Lager Sylt" and "Lager Norderney" were slave labourers forced to build the many military fortifications and installations throughout Alderney. "Sylt camp" held Jewish enforced labourers. "Norderney camp" housed European (usually Eastern but including Spaniard) and Russian enforced labourers. "Lager Borkum" was used for German technicians and "volunteers" from different countries of Europe. "Lager Helgoland" was filled with Russian Organisation Todt workers.