A team effort between Zombie and his wife, it's a map that was an experiment in level design. Him and his wife would have ten seconds to add rooms to a whiteboard. Monsters and weapons were chosen from a random set. A limited texture set was chosen and the map was completed within about 56 hours.
It requires the Doom 3 Expansion to play. You can download it from his site and click “Read More” for screenshots.
Not a bad way for a happy married couple to spend time together, eh? :)