There is a door in the Derelict Row sewers that clearly has an area behind it, but does not open. Is it part of a quest or do I need to find a switch/terminal? I am still in act 1.
Here is an image from the Deus Ex wiki, where I have circled the door in question:
Best Answer
If I remember correctly, assuming that that door is made out of bars (which I'm guessing is correct seeing as you say you can see there's stuff behind it), then it's used later on in the game as an exit back into this section of the sewers
In a quest you'll progress into the section you can see on the other side and that door will automatically be opened to give you a way out.