S.T.A.L.K.E.R.: Call of Pripyat Discussion
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.
Oasis is nowhere near the Pripyat's ferris wheel. The Oasis is in Jupiter...
@OP: The ferris wheel is outside of the normal playing area in Pripyat...
You can get to the Oasis through an underground tunnel. The tunnel is in the small building between the Ventilation Complex and the train rails. There are 5-6 Zombified Stalkers, in the building and several Rodents in the tunnel.
Inside Ventilation Complex, you need to solve a puzzle in order to reach the Oasis. In order to do this, go through every route in a straight line (there are about 5x4 pillars). Once you've finish going through every pillar in a straight line, you will see sparkles for the route, follow the sparkles and then you will reach the Oasis.
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