Sounds like a perfect hunt for a dusty canvas—and a few forgotten pigments. Just make sure we bring the right tools, because the first layer might still be hiding a whole other story. We’ll start with a gentle wipe, then a little light analysis, and only when we’re sure we’re not breaking a centuries‑old secret should we dig deeper. And hey, if the vault’s more brick than art, we’ll just have to write a new chapter about the history of abandoned tunnels.