I hope elaborate slightly off topic answers are okay haha
To me, depression is like being stuck in a dark cellar. No windows and only a single shitty lightbulb buzzing above your head type of cellar. Sure there's concrete stairs that seem to be leading up and out -- distant chatter and cars driving by and the sound of TV from somewhere high above prove a select lucky few have made it out. Problem is, the lightbulb casts weak yellow light on the first few couple of steps -- and you can't see shit past that. Even so, there should be a door at the top. Must be a door. An emergency exit or whatever. It's dark as hell, though, so you spend days, week, years climbing those steps in the dark, slipping, scraping your knees and breaking toes, and inevitably crawling back down.
Or better yet, taking a leap off the stairs hoping to break your neck and catch the infamous bus, but landing face-first on the floor, back where you started.
After some time and failed attempts at escaping either way, the desire to get on those stairs at all fades.
So you just sit there at the bottom. Alone. In the dark.
... Browsing the forums of SS.
Tldr: it's like a battle you can't win. A place you can't get out of, no matter how hard and long you try.