The undergroundx_100809_1933.zip file you have requested: Maps Levels Missions / Survival Maps / Left 4 Dead Survival Map The Underground - 380.89kb is not available. Perhaps try browsing all files for the game Left 4 Dead and upload any files you want to share or are missing. This is the only information we could locate:

Also ignore the nav errors message, my map has so many interconnecting rooms it cant properly create the nav flow. Don't worry zombies still spawn. This map is like an under ground system, it has 4 secret rooms that are much better.

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