The Combine is a former Creterakian prison station. During the Take-Over prisoners of war were shipped here. The prison was in use between 2643 and 2659. During that time prisoners of war were interrogated and tortured to give the Creterakian as much info as possible on their newly conquered Sub-Races. Although a lot of people were imprisoned in the Combine few ever got out.
Currently the space station is used as a testing facility. New GFL rookies go through a Screening Process here to make sure they don't have any biological or Cybernetics enhancements in place. When detected the subject undergoes a prison sentence if it can be removed and death sentence if it cannot be removed. beside that they are forever kicked out of the GFL.