The lab42.zip file you have requested: Maps / Single Player / Lab 42 Map - 1.91mb 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 map was set after Alpha labs 2 and before Lab 3 . . .The Marine Finds him self on a wipe-out the monsters mission. This map is still a first beta. Feel free to post comments on the map below.