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The Vivarium was a machine that served as a prototype for the ARK project.
There's a piece of the Vivarium project in Catherine Chun's room at Theta (beside her bed by the open dresser). If Simon Jarrett picks it up, Catherine will explain that the Vivarium served as the basis for the ARK scans and was the reason Catherine was able to scan anyone to begin with. She will also point Simon to another keepsake from Imogen on her desk.