Bank vault, post detonation, less than quarter mile from ground-zero. Concrete scoured away by blast wave exposing and bending ribar reinforcing. Could be Ranger shot; 47 kiloton. Operation Plumbbob 1957.
Yep, if you want to ride her out real close, looks like a bank vault is the place to be!
... here is a post about a company that bragged about their bank vault surviving the blast at Hiroshima!