Deep below our feet, mysterious structures the size of continents are lurking—and scientists are listening in. No, it’s not an alien base (probably), but these underground behemoths are sending signals that have researchers scratching their heads. Are they ancient remnants of Earth’s past or something far stranger? Either way, the planet might just be hiding a few secrets it’s not ready to share.
Scientists Listening to Signals From Huge, Mysterious Objects Inside the Earth
