Stalker: Clear Sky → Junkyard (Part 2)
Note: Be careful! Scar will lose absolutely all of his belongings in the basement. If you feel even a little sorry for him, dump your junk right in front of the basement entrance. You'll pick it up when you get out.
It turns out the basement is booby-trapped. It didn't kill him, but it left him severely concussed. Coming to his senses, Scar finds himself lying on the basement floor, and above him are two degenerates in bandit attire. It turns out they've been robbing curious stalkers who poke their noses into the basement for a while now.
The PDA mentions some kind of cache and Fang's involvement in the expedition to the center of the Zone. Lebedev contacts the station and reports that the cache's coordinates have already been deciphered.
See also:
Sniper rifles from Stalker: Clear Sky