Another idea - referencing to the typical cabinetry u see in bank vaults can be an interesting feature wall in the bar - i quite like this idea too! Safe Deposit Boxes in the Basement of the Historic US National Bank Vault - HDR
To set up the treasure hunt, Preiss traveled to 12 locations in the US to secretly bury a dozen ceramic casques. Each casque contains a small key that could be redeemed for one of 12 jewels Preiss kept in a safe deposit box in New York. The key to finding
If you need to stash some gear or supplies then you need to consider Survival Supply Caches, the Preppers Safe Deposit Box! geekprepper.org
What Should I Put In My Safe Deposit Box Or Fire Safe?