I have managed the installation of concrete and steel bank vaults in new construction scenarios. The specifications are normally provided by the bank. A designer admitted that no security system, short of lethal response to intrusion, is 100% secure. But he did say that anyone that "breaks into" the vault would leave enough evidence for investigators to capture the perps. It would take a lot of time and tools and sweat, not to mention other security systems that would have to be intricately disabled to give them that time.
Then he said something I had never considered. In all security endeavors, there is no defense against a clever heist (vs. "break-in"). In almost all cases where cash or box vaults are breached, it involves an employee (inside job). In these cases, knowledge is the weapon. And it's up to the bank to keep that knowledge secure. I thought that was insightful.
I grew up in the jewelry industry and designed several security systems for this high risk industry. The key is to delay the entry to valuables and make sure the security system cannot be defeated and the response time of authorities is less than time to access valuables.
I had to install data equipment inside a Brinks Armored Truck vault during the facilities construction.
Very impressive with the multi chambered entry ways into the vault area that had walls we couldn’t drill into to mount transponders.
Bits just spun and went nowwhere.
Had to use adhesives
Poured concrete with metal like shavings mixed in.