Stay alive

After coming to the area in the Yantar factory that is marked in your PDA, Maverick's voice announces that the challenge is starting, and you need to avoid losing too much blood if you want an extra reward.
==Walkthrough==
You may want to clear the factory out before triggering this quest and coming to the designated area.
After Maverick's announcement, several waves of zombies will spawn over the course of several minutes. Just like with other large battles, the spawn is centered around you, the next wave will spawn solely by timer in a random direction you don't look at, and will only spawn when you're not hiding.
The overhead crane and the area around the crane and the truck provide plenty of cover and a vantage point.
The last wave includes a mosquito zombie and psionic. After killing the wave off, Maverick will tell you to search all zombie bodies to find a Decoder module you asked for. If your HP never dropped to 40% or below during the challenge, he will also tell you about the extra reward. It can be found on the tallest factory roof, in a stash under a decayed body.
After his message, one last zombie will spawn nearby. Remember where he is, because despite Maverick saying that you have to search all bodies, the decoder module will always be on the body of this last zombie. You are actually not required to search the rest.
Pick up the decoder module from the body, and return to Docent to continue Decrypting the PDA.
==Notes==
* While the encounter isn't too hard in good daylight, most of the danger would come from being blindsided by a zombified Fury since they carry automatic shotguns and are heavily armored.
* If you want to loot all zombie bodies, the Serpantine artifact from Golem's stash will come handy as it's eliminates the random shock upon looting them. This will also advance you closer to the Zombie Fan achievement (search 100 zombified stalker bodies) and receiving the Snowball recipe.
==Bugs==
* Zombified stalkers are not smart enough to avoid anomalies. The last zombie could walk into a dynamic anomaly and be torn apart by it, softlocking the questline and subsequently the game.