You realize that what kills countries economies is inflation right? So you're better off to buy something of value like gold or diamonds and keep it in a safe, rather than what might become useless paper currency.
I've owned 3 safes, and the best one was a small in floor safe that was nor only cemented into the floor, but bolted to the lower slab as well. small and deep. About 10in square and 20in deep.
Very similar to this only square, not round......
