Rescue of Denis

Fang wants you to look for a stalker named Denis who was last heard from in the [ abandoned mine] in the northwestern section of the Red Forest.
== Walkthrough ==
The mine entrance will be marked on your map. Before you enter the tunnel, there will be severe tremors and screen flashes. After entering, a controller will spawn directly behind you and a mosquito zombie in front. Another controller at the end of the hallway will continue to cause distortion until you take it out.
Ignore the large number of zombies (they are all exploders) and head to the tunnels behind, where any natural spawns of the mine will be waiting if you haven't already dealt with them.
Denis will need healing, after which you can talk to him. He'll thank you and send you information on a stash in the forest, opening Stash of an experienced stalker.
A squad of ten mercenaries will spawn in the mines after your conversation, and for once they are not allied with the mutants. Let them tank the exploding zombies and move on once you hear them stop firing. Shadowman with a group of stalkers will also appear at the entrance to the mine and will take care of the rest of the exploding zombies on his own. You can talk to him for some flavor dialogue.
Continue escorting Denis back to the [ northern camp], and then report to Fang in the Bar.
== Notes ==
* Clearing out the natural spawns of bears, spiders, and snork variants deep in the mine before picking up the documents makes this experience much smoother.
== Bugs ==
* Mercenaries spawned in this quest do not leave behind grey dots on the minimap after dying.