Originally meant for the "#dmclub Channel Project" that was started last year, Systematic Corruption is a medium-sized e1-themed techbase.
Playing on U.V. should result in a ~300 monster count by the end of the level, while the lower difficulties are toned down a bit. However, you will probably still find somewhat of a challenge if you play on your regular skill level.
While playing, keep in mind that nukage/slime does no harm. Also be watchful of your ammo; unless you have a backpack you can easily collect too much ammo and waste it.
#dmclub, for starting the #dmclub Channel Project in the first place; had it not been for that, this map would not exist. DomRem and Belial, for giving 90% of the helpful suggestions/feedback. esselfortium, Macro11_1, Hobbs, Killingblair and several others for testing the map and giving feedback. Whiteboy567 for offering to test in multiplayer but never getting the chance to. Erik Alm, John Romero and Derek Braun (Dittohead) for inspiration. Rottking for the name. Zap610.