Mark Zuckerburg Is Reportedly Building Himself a $270 Million Survivalist Compound in Hawaii

Mark Zuckerberg is making sure that when doomsday comes, he’s prepared with an ultra-secluded, Leave the World Behind-type hideaway.

Per a recent investigation by Wired, the Meta CEO is reportedly building himself a sprawling 1,400-acre compound in Hawaii that will comprise at least 30 bedrooms and 30 bathrooms, divided among more than a dozen different structures. According to documents obtained by the publication, the Facebook founder has already shelled out a whopping $170 million in land purchases in Kauai beginning in August 2014 and will eventually fork over at least another $100 million in building costs.

At the center of the vast compound, called Koolau Ranch, will be two mansions sitting atop a survivalist bunker. The two residential buildings will total about 57,000 square feet and include elevators, an industrial kitchen, and conference rooms. Plans show that many of the doors throughout the home are expected to be soundproofed and operated via keypad. The dwellings will be joined by a secret tunnel that leads to a 5,000-square-foot underground shelter that’s protected behind a metal door filled with concrete. The bunker will feature its own living space, a mechanical room, and an escape hatch. The property aims to be further self-sufficient with an 18-foot-tall water tank and the ability to produce its own energy and food supplies.

The compound won’t, however, be all post-apocalyptic doom and gloom. Not only does it function as a comfortable family retreat, but there are plans for a wellness center that includes a full-size gym, multiple pools, a sauna, a steam room, and a tennis court. Elsewhere, 11 circular treehouses will be joined by rope bridges so that visitors can climb from one treehouse to the next without stepping foot on the ground.

The compound’s residential structures are hidden from the road, tucked behind a six-foot wall, and monitored by round-the-clock security guards. And, due to the scope and nature of the project, anyone who works on Zuckerberg’s property signs a strict nondisclosure agreement, sources told the publication. “For a private project to have an NDA attached to it is very rare,” a local construction official explained to Wired.

Whether the tech billionaire will use Koolau Ranch as a part-time or full-time family retreat is still unknown. However, the magazine reported that he’s already hosted two different corporate events at the compound, so its charms, luxuries, and secrets may not stay so secret for long.