When Bernard Jones Jr. and his wife, Doris, built their dream home, they didn’t hold back. A grotto swimming pool with a waterfall for hot summer days. A home theater for cozy winter nights. A fruit orchard to harvest in fall. And a vast underground bunker in case disaster strikes.

“The world’s not becoming a safer place,” he said. “We wanted to be prepared.”

Under a nondescript metal hatch near the private basketball court, there’s a hidden staircase that leads down into rooms with beds for about 25 people, bathrooms and two kitchens, all backed by a self-sufficient energy source.

With water, electricity, clean air and food, they felt ready for any disaster, even a nuclear blast, at their bucolic home in California’s Inland Empire.

“If there was a nuclear strike, would you rather go into the living room or go into a bunker? If you had one, you’d go there too,” said Jones, who said he reluctantly sold the home two years […]