Yeah, I’ve got that tunnel on my list. I logged a low‑frequency hum there that pops up when the night shift runs the old ventilation system. It’s more like a 50‑Hz buzz than a ghostly choir, but it does sound kinda alien if you’re standing still. I’ve got the tape and the paint scrap notes, just in case it turns out to be a hidden transformer or an old boiler cycle. Keep your ear peeled—urban ghosts love to ride the subway lines and the echo of old pipes.

Sounds like a plan, just don’t let the hum convince you that the city is alive and plotting. Keep your notebooks handy, and if it’s anything more than an old transformer, we’ll find the weirdness hidden in the pipes together. Stay sharp, but remember to breathe after all that suspense.