The prison is a small, homely area. The main area consists of only a workbench, a sheet of corrugated metal, and a stool. Several tools can be seen scattered across it. Located on the other side of the wall are Allison and Tom's living quarters.
A small, cramped cell is located behind a grate, with only a bed and shelf to occupy its inhabitants. There is a secret bathroom located off of the cell, that is reachable upon "taking" the spoon.
After several exposition cutscenes, Tom and Allison Angel leave Henry trapped in his cell as Ink Bendy is suspected to arrive. However, using the newly-acquired Seeing Tool to guide his way, he escapes after locating a Gent pipe found in his cell toilet's water tank and breaks apart some wood that blocks the path to proceed towards the barge port, before departing with a boat to the lost harbor.
- There is an axe located in the aquarium. It is impossible to acquire it.
- Before the fifth chapter was released when the third teaser screenshot is uploaded, one of the developers, Bookpast, leaked the fish's model while updating his Twitter profile picture. Considering this, these fish possibly reference Bookpast's own fish avatar.