I stayed in a home like that for awhile in Leisure City, FL after Andrew decimated my place. There's a whole development of about 4 streets that were built there in the 50's and 60's for snowbirds. They ARE bunkers .. not a thing was structurally touched on those places, 5 mins. from where Andrew's bomb went off (my location). They are awesome.
Sorry bout your home. I flew in there with the National Guard and it was not fun at all. That's why I keep banging away at the safe home issue to anyone who'll hear.