Stalker: Call of Pripyat → Quests → Oasis (where to find it)
Scientists on Jupiter will task you with finding the legendary Oasis—something that has a positive effect on humans. Interviewing stalkers, unlike regular quests, won't yield anything. Oh well—we'll find it ourselves. First, let's head here:
Here is the Oasis. The dotted line marks the "underground" section of the route.
The place where the dotted line begins is the entrance to the ventilation shafts. There are a lot of jerboas there, but not many zombies. We enter the building, go "deeper," turning left, and then the entrance to the shafts. After wandering through the tunnels for a bit, we come to a nondescript room, which is the last obstacle before finding the Oasis.
Personally, it's quite difficult for me to describe the process of getting through this obstacle in words, because no matter how hard I tried, I couldn't figure out the algorithm (and I didn't even understand how I got through it). Here are some eyewitness comments:
...you need to run around the perimeter of this room, either clockwise or counterclockwise (I don't remember which way I ran). After running around the entire room and passing through the "electric rain," run again (along the perimeter, not straight ahead) to the second passage with the anomaly. You'll be thrown back to the first exit, but another section of the room will light up. Run around the perimeter again, back through the passage. And do this three times, I think. Eventually, after another run like this, you'll be able to go through that ill-fated corridor and reach the oasis (it's located directly under the round thing, according to the map, but you can't climb up there). © Ambi
We receive a task from the scientists. We go to the end of the railway from Yanov. There's a building to the left of the tunnel. We enter it and kill the zombies, watch out for the jerboas and run in the direction they're coming from. And then we're sweating. We wander a bit and come to a hall with columns. We simply pass them a couple of times, waiting for the stars to light up. When the stars appear, we follow the passages they indicate and find the Oasis. We rip out its heart, kill two psi-dogs, and return to the scientists. © Chemist
In short, it's complicated. After the game autosaves, exit to the Oasis, grab the artifact, and escape the wrath of the angry pseudo-dogs by going up the stairs. That's it, you can go to the scientists and give them the artifact.
Source: gamer.ru
See also:
Dungeon in Terraria (biome)
Fallout Tactics: Newton
Silicon. Uses of silicates