The Sevastopol is a location in the game Alien: Isolation
It is a supply depot in the region of Zeta Reticuli. It's a permanent freeport facility.
Orbits KG348, a Gas Giant. It is a short distance away from LV-426
The Sevastopol station is owned and operated by the Seegson Corporation
At the beginning of the game, Amanda Ripley and Samuels are headed there on board the courier ship Torrens to retrieve the data from the flight recorder of the Nostromo. The flight recorder was found by the Anesidora and might contain clues regarding the disappearance of Amanda's mother, Ellen Ripley.