Space,
Prey was originally designed and developed alongside Unreal as a competitor. I believe the primary programmer on the project had a brain aneurysm and died, so the project was shelved for a period. The prey today is a totally different product from what was presented long ago, with the only similarity being the Portal technology.
I didn't fact check, this is straight from memory, but I am pretty sure it's moderately accurate.
Playing: FFXIV, Stellaris, Age of Wonders 4
Xbox Live: Heinekev
PSN: Heinekev