The dark_zone.7z file you have requested: Clear Sky / Mods / Singleplayer / Dark Zone - 12.72kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R.: Clear Sky and upload any files you want to share or are missing. This is the only information we could locate:
Like the darkness? Than you will enjoy this mod, which makes the zone under the black for the whole playtime.