Inside plans for Mark Zuckerberg massive $260M bunker on secluded Hawaiian island

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. Reports about the project sparked concern in certain corners of the internet and saw a flood of inquiries directed at companies that construct sub-terrain shelters. Zuckerberg, executive chairman and CEO of Meta, which owns Facebook, Instagram and…