My only question is, if you have something like that , why show it and how it works.
In the 30 years I have been a builder, I cant tell you how many hidden rooms, vaults, safe rooms, and storage I have done.I never can understand that once completed, they show it off to 50 or more people???Why build a hidden vault , room, if you show it off?I just never have understood it.Yes, in this case I believe it to be an ad for selling this type of storage system.