"Monolith" fighter's map

Dan asks you to help Cat out.
Part of this quest is unmarked.
== Walkthrough ==
This quest starts with an unmarked dialogue with Dan, starting with "What do you want?". Dan tells you to meet Cat, a former FSB member (essentially a Russian version of the FBI) who ended up in the Zone somehow and dug something interesting out.
Cat will be in the middle of the Swamps, his position marked on your map. Go and speak to him. He tells you that he was investigating suspicious Monolith activity in the locations unusual for them. He followed a Monolith squad to Radar and got bad radiation poisoning there. Luckily, then one of the Monolithians got into a radioactive zone as well while the squad was at the Swamps, and died there. Cat wants you to help him reach the body and search it.
After the dialogue, Cat will start running towards the [ burnt farmstead], and stop next to it. You have to enter the farmstead (it's heavily contaminated, as Cat said, so you will need some good antirad artifacts or some antirad pills), and search the body of the Monolithian. Bring the document from his body to Cat. It turns out to be a map of the Swamps with some notes.
Cat will say that he needs time to think, and goes to the Clear Sky base.
== Notes ==
* The Monolithian body is scripted to have a Plasma Caterpillar on it, however you might end up finding a Cobblestone instead. See the Artifact_decay#Blowout for the reason. Technically, the body is generated on the first entry to the Swamps in the disabled state, and is only enabled after the first dialogue with Cat. So if you've experienced blowouts between first entering the Swamps and this quest, there's a chance the Plasma Caterpillar decays into a Cobblestone.
* It's very possible that anomalies capable of corpse destruction, such as a Bubble, can spawn near or on top of the Monolith soldiers body, destroying the corpse and the map within it. Be sure to save before speaking to Cat and starting the quest, just in case.
== Bugs ==