The “Upside Down Skyscraper”

Saudi Arabia is planning to build an underground city, and billing it as an “upside down skyscraper.” It’ll be 330 feet deep, so not really “skyscraper” height, more like a 25-story underground building. They plan to dig into the side of a mountain, and fill the hole with a massive network of homes, stores, luxury hotels, movie theaters, and everything else you’d need or want. The spot they picked out is right by the ocean, and you’ll enter by taking a boat through an underground tunnel. This is like, if a Bond villain built his underground lair in a volcano . . . and wanted to bring along several thousand friends . . . and an Orange Julius shop.