I’ve stared at plans like that before. A vault that looks clean on the surface can be a perfect cloak if the seams are hidden. Keep the entry lines double‑layered, use false walls that open only on a hidden trigger, and route the power lines through the same tunnels you’ll use for escape. Every corridor should be two steps ahead of a guard’s line of sight, with dead ends that loop back into the main line. If you can make the whole thing feel like a normal storage facility while the secrets are buried in the shadows, the vault will stay covert. Just remember: the simplest look often hides the most intricate plan.