Four-Power Authorities of Germany. Both were in West Berlin, Germany, and existed during the Cold War from 1948 to 1989. These were the Berlin Air Safety Center and Spandau Prison (which was demolished in 1987 when Rudolf Hess, the sole remaining prisoner, died). These two organizations were uniquely four-powered in that American, British, French, and Soviet authorities cooperated in their management. This was a far cry from the intensely adversarial relations the allies had with the Warsaw Pact leader in almost every other aspect of world affairs during this time. Both organizations remained low-profile and secretive during their existences to avoid highlighting
Spandau Prison Hess during their confinement at Spandau. The prisoners were assigned numbers corresponding to the order in which they were first assigned cells and were, by regulation, referred to by their number only. Speer, number five, was the most ambitious of the prisoners, dedicating himself to a rigorous physical and mental work regime, then scheduling "vacations" of two weeks in length every few months where he relieved himself from his self-imposed routine. He secretly wrote two books, a draft of his memoirs entitled "Inside the Third Reich" and a collection of diary entries, "." Speer also kept busy with architectural works,