Just think of it as doomsday prepping gone chic. In the past few years, the ultrarich have been quietly getting their homes ready for the next big disaster by building luxury underground bunkers.

Witness Meta CEO Mark Zuckerberg, who’s reportedly building a $300-million compound in Hawaii — complete with a 5,000-square-foot bunker that has its own energy, water and food infrastructure. Or Microsoft co-founder Bill Gates, who reportedly who has bunkers under several of his homes. Or Kim Kardashian and Shaquille O’Neal, who are also said to have explored the idea.

“What were once rudimentary shelters have become bespoke sanctuaries,” Naomi Corbi of SAFE, a firm specializing in secure residential design, told Robb Report. “Today’s clients want features that mirror their lifestyles — often w

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