In the vault

Just in case you've ever wondered what the inside of a large meter vault looks like, here's one that's unusually clean and dry. I'll try to get a picture of the more common disturbingly wet and filthy vault sometime.

They don't get wet from leaking water. They get wet from condensation and rain, and there's no place for it to go but in evaporation. But in a closed vault, not much evaporation occurs.