Metro Last Light Quarantine starts right after Artyom and Anna are rescued at the end of Contagion chapter.
Quarantine, or Chapter 20, is a very short mission in which Artyom only has to follow his waypoint to reunite with Khan.
However, there are three Metro Last Light collectables available in Quarantine, hence players can use the following collectibles guide if they wish to find them in a single playthrough.
Chapter 20 Description
EPIDEMIC
“The pieces of the puzzle are falling together, and the big picture is horrifying and unbelievable. I will tell the others about this, but I still can’t make myself believe it: the Reds have infected Oktyabrskaya, a peaceful stations, denizens of which never suspected anything, with an unknown deadly virus.
And then their mop-up squads entered it under the pretense of saving the station from the epidemic and eliminated everyone they could – women, children, old people. To prevent the infection from spreading…
And if all this is true, then me and Anna could be infected too. We’ve been saved from being killed, but we don’t know if we’re going to survive for long.”
Diary Page #1
After you wake up, follow your waypoint and you will eventually find a doctor and an officer talking.
Follow them inside the decontamination room and wait for the lights to turn green. When the path is clear, advance in the next room, and before heading into the area guarded by soldiers with gas masks, turn right, around the desks, so you can see the first Metro Last Light Quarantine Diary Page on the desk in front of you.
“The Reds were quite possibly hoping to enter a station completely wiped by the virus, but it took too long to do that and they got impatient. They did not just wait for the outcome, they hastened it.
The survivors say that when the purging of the station started, the Reds allowed some supposedly contaminated locals to escape to the neighboring station, the Oktayabrskaya-Koltsevaya. But those escapees were closely followed by the execution squads.
If not for a team of Order fighters who just happened to be at Koltsevaya at the time and repelled the Reds, by now they would have two stations and Hansa would be cut in half. But the Order managed to avert that.”
Diary Page #2
Use the compass in the quarantined zone until you meet up with Khan. Follow him, and when he turns left and enters a room, turn right instead, and you should see a desk next to the grate door.
The second Metro Last Light Diary Page in Quarantine is on that desk, and it is number 28 in the videogame.
“Now the Oktayabrskaya-Koltsevaya belonging to Hansa is a cross between a hospital and quarantine zone. All the refugees from the neighboring station and everyone had contacted them are being put into plastic boxes. And that’s it. Nobody tries to treat them.
Everyone suspected of being infected sits in his plastic cage and his death sits across, playing stares with him. A minute of this game lasts an eternity.
The losers are infected, die and get burned. Death is too good of a player to give his opponents many chances of winning.”
Next, get inside with Khan, and before going any further play the Musical Instrument that’s on the left side, as you’re looking towards the gun shop. Now you should go with Khan in the tunnels to start the next chapter that is also known as Khan.
