|The following is based on Van Buren and has not been confirmed by canon sources.|
The Boulder Dome level 3 is the 3rd sub-level of Boulder Dome. Along with the Boulder Dome level 1, and Boulder Dome level 2. This level was intended mainly to be reserved for research and as living quarters, but could be consolidated into Boulder Dome level 2 if the space permitted.
More of the dome interior. Research and living quarters.