Underground shelters are now attracting wealthy elites, tech billionaires, and those looking to ensure their survival during the ultimate catastrophe. From high-end bunkers to sprawling fortified ...

In a former Army munitions depot outside Edgemont, South Dakota, rows of concrete bunkers with steel blast doors sit across the Black Hills landscape, forming a survival community called Vivos xPoint.

THE TERM “prepper” once carried a hint of derision, describing paranoid types who stockpiled supplies—and perhaps guns—in anticipation of society’s collapse. But in recent years—with climate change, ...