REF070507 is an enigmatic picture contained in Server 05.
Background[]
Its exact origin is unknown, although presumably it is of Forerunner origin. It is titled "Flood Containment Control Infectious Study REF #070507," and appears to have a high-resolution micrograph of what appear to be microbes, presumably of Flood origin. In the bottom left-hand corner is the text "CNO DR54 G 48." Along the bottom surface is a rectangular tab, and on the left side is the text "CnRL - Infc," presumably referring to the control group (CnRL) and the experimental group (Infc), two integral components to the "infectious study" experiment being photographed. In the center of the tab there is a dot, and on the right-hand side there is the text "HR 568."
Just off-center of the photograph is an amorphous blob filled with small circles. This has been hypothesized to be a cell infected with an obligate intercellular parasite, just as a virus, very possibly related to the Flood. Surrounding this cell in a half-circle arc is a rim-like structure.
REF070507 is part of the Iris viral marketing campaign for Halo 3.