Modules were furnaces within overflow camps in which Category One patients, who were deemed dead, were burned.
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A Module burning category one patients. (TV: The Categories of Life)
Colin Maloney trapped Vera Juarez within one and burned her to prevent her from leaking information about conditions at the San Pedro Overflow Camp. (TV: The Categories of Life)
Geraint Cooper was scheduled to be incinerated inside a module; he had suffered from a fatal heart attack. However, Geraint was rescued by his daughter Gwen, who later blew another module up. (TV: The Middle Men)