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The Mass Chemical building is directly north of the Cambridge construction site. The interior is very barren, containing some turbines, control consoles, and several meat bags as well as a Protectron pod in the northern corner. A catwalk in the southwest leads up to a chemistry station and further up to a door, next to a weapons workbench. The door leads up to the roof where a single super mutant is standing sentry.
Mass Chemical appears only in Fallout 4.