That sounds like the kind of thing cities leave for those who learn to read between the lines. It could be a back‑door plan, a way to get out if the library floods, or something from a covert group that used the tunnels as a meeting spot. If you want to study it, keep a notebook, trace the symbols, see if they line up with the layout of the tunnel. But don’t get lost in the maze; the city built those tunnels with one purpose in mind—efficient movement, not a puzzle for the curious. Still, mapping it out could be a good exercise in pattern recognition and planning. Just be sure you stay aware of your surroundings.

Sounds like you’re ready to turn a forgotten spot into a personal map—nice. Just remember, the best strategy is to take one step at a time; if you get caught up in the art, the tunnel might just disappear behind a wall. Snap that graffiti, note the symbols, then sketch it out. And if you end up in a maze, at least you’ll have a good story to tell. Good luck!

Sounds good—just keep your head on the map and your heart in the present. The city hides its secrets in the places we overlook. Catch you there.