After I pressed it, someone said "This can't be good" and ground's shaking. I thought water should fill in this sewer or something but no, nothing else happened.
Is there any event about it? Or is it some kind of easter egg?
What does the Red button of a computer inside Hollywood sewer do
wasteland-2
Best Answer
You will get an achievement for pressing it. A Steam user is mentioning it on this post (tenth comment) and it is confirmed by the Wasteland 2 Achievements Gamepedia Page. The achievement is called "Pushed the button".
Also, this Achievements Guide tells you exactly how and where to get it.