Every time someone says this I am baffeled!
Why would it be a security breach????
Even the most stupid of people must realize they do have some jewelry in the house. And imagine there is some kind of vault to keep it safe. It is rather like being flabberghasted the lokal bank has a vault and they keep money in it.
It does not give directions on how to get there other than in the basement. They could have several stories of under earth storage rooms and BP takes up some considerable sqm.
As long as nobody gives unmistakable directions (go down to -4, turn right at the secon corner, open the third door on the left) or a map I'd say this is nothing to blab about at all.
What's next? Everyone getting conniptions when they reveal there is a wine cellar in BP, too, storing wine worth millions?