The dm_oldbase.zip file you have requested: Maps Levels Missions / Deathmatch / O to P Titles / Old Base Map - 4.02mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
This is a mid sized DOOM 3 Deathmatch map with inspiration drawn from Quake 2. This map supports up to 8 players.