Carroll Street Station is a secret level in Marathon Infinity. It is part of the third chapter, Rage. That chapter contains two timelines, and this is the last level of the first timeline.
Terminals 
haga.kure
This terminal contains a few broken up phrases by an unknown sender (the terminal has an "infinity" logo). Apparently, the moon K'lia, the home of the S'pht'Kr, is now dust—no doubt having been destroyed by the trih xeem.
Sources
Marathon Infinity - Level 29: Carroll Street Station