The boneyards_downward_spiral_v101beta.zip file you have requested: Maps / Single Player / Boneyard's Downward Spiral - 1.96mb 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:
A single player map that puts the player in a pit full of demons. The playermust travel downward in the pit watching out for demons and traps. Map is afirst work ever by author and will be a level in upcoming MOD/Expansion called'DooM 3; Hell Awaits'. This map is eta quality and in no way will resemble theend product.