That’s a solid idea—imagine overlaying a 3‑D thermal gradient on the tunnel map, with each sensor ping updating the heat map in real time. I’d tag every point with timestamped packets and run a regression to flag anomalies. Just remember to keep the calibration logs in order, or the heat signatures will drift and you’ll end up chasing phantom leaks. Also, if you’re going down there, bring a tracker; I keep losing my own tools otherwise.