Facebook founder Mark Zuckerberg has spent the past several years acquiring an enormous parcel of land on a picturesque and secluded Hawaiian island.

The tech billionaire is in the process of building a luxury estate, rumored to be costing him a cool $260 million, but included in the plans is a secretive underground bunker that’s twice as big as an average Australian home.…

This data comes from the ChinaPulse.com media intelligence and smart news insights monitoring platform.