This is 1st time i see it, it's a full map in Core City sewers, which seem to exist instead of the map with a mutie camp and several roaming mutie workers sorting through piles of junk. In this one, there's a crane which can move few piles of junk, controlled from the only working console, and some siphoners here and there - no muties at all.
And there's what looks like a door in the northern wall, but it ain't interactive nor highlighted as a door (visible in the screenshot's upper part). That made me curious and i went to wiki hoping to learn more - whether that door is just scenery or not - but to my surprise i can't find this area's page in the wiki, at all.
Is this some kind of secret event or am i just being dumb about failing to find it in wiki? %)