Mark Zuckerberg's Hawaii Doomsday Bunker and Underground Shelter

planned

Mark Zuckerberg is building a $270 million Hawaiian estate named Koolau Ranch on the northeast coast of Kauai, Hawaii. The project includes multiple mansions, an entire village, and a 5,000-square-foot underground bunker designed as a doomsday shelter. The estate will be self-sufficient with its own water reservoir, farming and livestock operations, and various luxury amenities such as guest accommodations, gym, sauna, swimming pools, tennis court, and treehouses connected by rope bridges. The bunker features soundproof metal and concrete doors to withstand potential threats.