[Credit to Windbreaker for the title.] "Until they've searched thoroughly, one can never be clean." In this scenario, you get to spend a bunch of time cleaning up a space of its filth balls with your trusty Yucatan Suckaman™ vacuum cleaner. But watch where you step, and be sure to empty the bag often so the vacuum cleaner doesn't explode!
Today I added the 50th map made for Marathon: Sucks, "The Fracturing of the Husked Civilization Stations". This can be downloaded individually or with other maps or the scenario itself at the provided link.