Metro Last Light Chapter 21 bears the name of one of Artyom’s friends, Khan.
The mission starts as soon as Artyom and Khan enter the tunnels in the previous chapter, Quarantine.
Artyom has to catch up with the Dark One and at the same time get closer to Polis, and in order to do that he must ask Khan’s help because he knows some shortcuts in the tunnels.
There’s only one Artyom’s hidden diary page in Chapter 21, but the mission can be lengthy and the collectible easily missed.
The exact location of the Diary Page is revealed in the following Metro: Last Light game guide.
Chapter 21 Description
THE RIVER OF FATE
“In some other time and place, what happened could be life changing. But there is no time but present and no place but the Metro for us.
And we must do everything we can to save it. I have to hurry and catch up with the Dark One, Anna has to tell her father of what Korbut and Moskvin are doing. Anything else is a luxury we can’t afford right now.”
Diary Page
When the gate is opened, get inside with Khan. He tells a soldier to open the inter-line tunnel, and once you’re inside you have to go through some big fans.
Then you enter a dark area and Khan turns on his flashlight. Just around the first corner he will drop down on some pipes.
Don’t follow him, instead go straight through the door that’s in front of you, because it leads to a small room where you can find the Metro Last Light Diary Page collectible available in Chapter 21 (next to a skeleton).
“I remember Korbut calling the operation they were going to carry out at Oktyabrskaya “an experiment”… What if this massacre was not a prelude to a great war, but just a test of the new monstrous weapon?
What if the Reds are simply distracting Order and Hansa, all while preparing a much more powerful, overwhelming attack? I wanted to be a soldier. To protect humanity. But all the blood I spilled didn’t help me prevent the war that’s already started. I didn’t become a superhero capable of killing the villain and saving the whole world. Not that I didn’t dream of it. Everyone does.
But when the war starts, most turn out to be just cannon fodder. Many don’t even survive their first engagement. And I, as a little gear, can only spin on the predetermined axis and watch the massive flywheel of slaughter unwind.
That, perhaps, is why I am going with Khan. This might be my only chance to change anything.”
Head further into the sewers, and after the incursion in the past you need to board the railcar in order to end the chapter and start the next one in line called The Chase.
