The player characters in this chapter can be any of the survivors with the exception of Conrad, though if the advice in Distress Signal has been followed, the player characters will be Brad and Julia. Walk down the hallway and take a left when possible to enter a room to find a safe. Interact with it to pull out a hidden sheet, which can be turned over for Secret #48: Minutes of Meeting. Continue down the hall and enter another room on the left to find Secret #27: Private Patterson's Medical Record on the counter. Return to the hallway and take the door to the right to continue forward, using the prompt to drop down at the end of the path.
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After dropping down, follow the path until it splits. Go left first (away from the camera) to find a book atop a cabinet. Flip through it for Secret #8: Engine Room Telegraph Log. Head the opposite direction to continue forward. A Picture, Know the Ropes, can be spotted in a locker along this path. Backtrack to the opposite wall to find the generator, which can be interacted with to trigger an achievement/trophy (if the hints toward the ship's name were found previously). To the left of the generator is the exit. Through here is a scene, after which a choice is presented concerning the rebreather; choose to take it to unlock an achievement/trophy in the next chapter.
Succeed at the subsequent "keep calm" sequence in order to gain access to Secret #34: Military Orders in the next room. This can be found on a cabinet to the right, via a slip of paper that must be turned over. Make sure to interact with it as soon as possible, as time in this room is limited; when the scene starts, the player character is locked out of exploring the room further. If Julia's ring was taken earlier, she can get it back by inspecting at the next choice. After another "keep calm" sequence, a choice is presented to run (leading into a QTE) or continue hiding (leading into another "keep calm" sequence); succeed at either to avoid losing the rebreather as the survivors proceed into the next chapter.