The sv_lifeonmars_040909_2392.zip file you have requested: Maps Levels Missions / Survival Maps / Left 4 Dead Survival Map Life on Mars - 4.2mb is not available. Perhaps try browsing all files for the game Left 4 Dead and upload any files you want to share or are missing. This is the only information we could locate:
Survival mode for Mars Federal Colony. I will add this to the campaign once that is completed, but for now, enjoy the chaos of survival mode!