Zuckerberg is in the process of constructing Koolau Ranch, a 1,400-acre compound that includes two mansions and a dozen buildings.

Last December, a lengthy Wired investigation said Meta CEO and Facebook founder Mark Zuckerberg was in the process of building a 1,400-acre compound on the Hawaiian island of Kauai, which would include a underground shelter spanning over 5,

Mark Zuckerberg describes his bunker, part of his massive Hawaii property, as "just a little shelter." The compound contains 12 treehouses, two mansions, a 5,000-square-foot bunker and extreme security measures.

Meta CEO Mark Zuckerberg told Bloomberg a reportedly 4,500-sqaure-foot basement in his Hawaii compound was just a "little shelter."

CEO of Facebook Mark Zuckerberg walks to lunch following a session at the Allen & Company Sun Valley Conference on July 08, 2021 in Sun Valley, Idaho.

Mark Zuckerberg denied rumours of a “Doomsday bunker” beneath his $270M Kauai estate, calling it a basic shelter like a basement. He emphasized the ranch’s focus on raising high-quality cattle, not building a survival hideaway.