Institute Sublevel 21-D

The Institute sublevel 21-D is an unmarked location within the Institute in 2287.

Background
This small underground area is the nucleus of the Institute's expansion even further underground. Gen 3 synths labor in its tunnels, overseen by Gen 2 guards.

Layout
A small area, with an Institute storage room and the expansion caverns, where synths work on expanding it ever further underground with restored megaloaders.

Inhabitants

 * G9-81

Appearances
Institute sublevel 21-D appears only in Fallout 4.