Mark Zuckerberg’s Hawaii compound includes a 5,000 sq. ft. underground shelter

FILE - This Jan. 15, 2017, file photo, shows public Pilaa Beach, center, below hillside and ridge top land owned by Facebook CEO Mark Zuckerberg, near Kilauea on the north shore of Kauai in Hawaii. A Hawaii Senate committee is scheduled to hear a bill that would force landowners into mediation before they are allowed to file lawsuits to acquire small parcels initially awarded to Hawaiian commoners during mid-19th century land reforms. The bill was introduced after Facebook CEO Mark Zuckerberg, in late 2016 filed, lawsuits to identify owners of 14 parcels interspersed within a 700-acre oceanfront estate he owns on Kauai. (Ron Kosen/ via AP, File)

Meta founder Mark Zuckerberg is spending a reported $270 million building the ultimate home in Hawaii.