The Sewers is a dark transition level with small passageways.
The Sewers has low visibility, with a circular arc surrounding the player's character representing their field of vision. Corridors are much narrower than other levels, which can cause issues if not taken into account. Completing the Sewers leads you to the Scrapyard.
- The main theme for the Sewers is "Groundwork of the Past". It has no alternate theme.
- The boss theme for Mom is "Lament of a Mother".