Figure 29: The roof today, with the same notations as Figures 27 and 28. Z1 was not reopened, but its location can be determined from Figure 28 and from measurement inside the chamber (see Figure 31 and relevant discussion). © Holocaust and Genocide Studies, Oxford University Press, Volume 18, Number 1, Spring 2004, pages 68-103. Used with permission. [an error occurred while processing this directive]