The Under2.zip file you have requested: Maps Levels Missions / Doom2: Underground (Map) - 1.04mb is not available. Perhaps try browsing all files for the game Doom II and upload any files you want to share or are missing. This is the only information we could locate:
This level takes you into the depths of the earth and into places where you have never seen. This will be the best level to download and the best is to come in underground 2 lava domain. This is a neat single player level.