Find a way to expose the Red Line leader's deception | Chapter 29: Polis Metro: LL Guide
Last update: 11 May 2016
Keep following your allies, and devote some time to eavesdropping on people's conversations (also from the independent ones). After you pass through the long corridor, you will end up in a slightly bigger room. . Examine the couch to the left (the above screenshot) to find an Artyom's diary page.
Walk now into a definitely bigger room and go straight ahead to reach the room with Moskvin in it. Wait now for the Dark One to take action.
After you regain control over Artyom, start opening the door in the infinitely long corridor (it is completely up to you which ones you choose). After you open each door, you will watch a short retrospection. In total, there are four such retrospections for you to watch.
Wait until you return to the reality. Now, the game will play several additional cutscenes, after which this chapter concludes.