The underground shelter, which was revealed last year, prompted conspiracy theories on social media about wealthy tech moguls building doomsday bunkers.

In addition to the massive bunker, Zuckerberg’s $100 million compound, which is roughly 1,400 acres and known as Koolau Ranch, will have its own energy and food supplies, according to WIRED. When coupled with the land purchase, it will eventually cost more than $270 million.

After Mark Zuckerberg's Hawaii empire expansion was blasted as controversial, he downplayed the underground bunker on his $100 million compound.

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.

Mark Zuckerberg has opened up about the supposed "doomsday bunker" that he is constructing under one of his homes. The 40-year-old Facebook founder has been discovered to be constructing a 5,000-square-foot bunker under his property in Kauai,