Ex modder, Zones only ferret and will someday release a game (Resident)
On forum: 02/20/2010
Run and jump onto the tree, it can take a few tries.
As for getting into the closed off area, come in the west gate, go between the wall and the drainage pit on the west, and head down to the wall. You should notice that a wall segment is just lying against another, and there is a gap between them you can move through when low crouched. Most of the area is highly radioactive, btw.
Go south down the road in the middle of the Dark Valley and leave it
at the fence line that goes eastward towards the Fault Anomaly location: http://cs.stalker-game.com/en/?page=anomaly01
Hug the fence all the way there until you detect the Anomaly you seek
and then leave the fence going directly north to where it awaits. Do it
quickly and then return directly south to the fence the way you came in.
Oh that. It's been debated if that's actually a Fire Poltergeist or some
mobile Fire Anomaly. Maybe a Modder can read the Game Files and
answer that one. You don't need anything special to get through it.
Just time yourself when it is at the farthest southern point and run
through it to get to the end. If you do it quick enough you'll get
no damage and the Backpack Stash is under the ramp leaving.