This chapter takes place from the perspective of Fliss in the Theatrical Cut and Brad in the Curator's Cut, though it will be skipped over if Brad didn't find the gas mask in Finding Friends and if Fliss didn't step outside in Ritual. Follow the path until a prompt appears to climb up. Before doing so, walk in the direction opposite the prompt to find a corpse with Secret #25: Ghost Rumours Report beside it. This is the only collectible in this chapter, so feel free to climb up afterward.
10
After climbing up, examine the item in the corner of the room. While Fliss/Brad won't pick it up now, take note of it as it will prove useful later. Explore the area until a prompt appears by the open grate in the first room. If playing as Fliss, make the worried, frightened, and expectant choices in the ensuing conversation to unlock her Arrogant Trait. Then wait until a scene triggers in which the area below begins to flood. Choose to search and Fliss/Brad will pick up the item in the corner examined previously, then choose to smash the hinge twice to free the character stuck below.