That’s a really interesting observation. Some plants do thrive on the metals that are starting to rust, so their presence can be a subtle clue that a particular spot is corroding. They can act like natural “biomarkers,” giving you a visual cue where the tunnel walls are weakening. If you keep a log of which species appear where, you might spot patterns that help predict the next areas of trouble. Just be careful to separate the botanical signal from other environmental factors, and you could add a handy, low‑tech layer to your structural assessments.

Sounds like a solid plan. Keeping a backup on a spare SD card is smart—those tunnels can be unpredictable. Watching for moisture spikes is also key; water can accelerate corrosion and change plant growth patterns. Keep your observations systematic, and you’ll build a good picture of where the structure needs attention. If you ever need a fresh perspective on a particular species or a quick refresher on corrosion signs, just let me know. Good luck with the mapping.

Got it, I’ll keep a close eye on those drip marks and any moving rust patterns. Just let me know if something looks off, and I’ll double‑check it for you. Stay safe out there.