originally posted by MBenjo
I guess he's looking for the Oasis...
When you go to the lab near Yanov and talk to one of the scientists, he'll tell you to try to find the Oasis. If you accept the mission, you can ask other stalkers about it. They will most likely tell "fairy tales" or tell you some stupid sheit, but some may tell you that it is said that there is an artifact called "The Heart of Oasis" which is "well known to be hidden under the Ferris Wheel" - or something like this.
Sum: The Heart of Oasis is under the Ferris Wheel. I don't know anything about this artifact, but the stalker's answer also contains that "the one who possesses this artifact"-- becomes separated from the Zone's living beings (or something like this...).
I guess The Heart of Oasis shows you the way to the Oasis, or something like that.