Lower Levels is the term used for the sections of the Old City Sanctuary that are located below ground level (sub-level). It is the main "Abnormal Housing" section of the facility were the Sanctuary team primarily, in particular Dr. Helen Magnus, do their Abnormal medical and science work.
Areas featured in this section are:
- Catacombs Medical Lab Station 
- Henry's Work Area
- Isolation Area
- Main Lab
- Medical Recess Area
- Medical Science Research Lab
- Observation Area with attached Observation Deck 
- River Gate
- River Pool 
- Wine Cellar
Background, Notes, and Trivia
- This section is referenced as "Lower Levels" by Helen in Episode 1x10 - "Warriors" and by Will in Episode 3x12 - "Hangover".
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