What This Sumerian Tablet Says Exists Beneath Earth Is Shocking

What this Sumerian tablet says exists beneath Earth is genuinely shocking, and it isn't a myth. Carved into a 4,000-year-old clay tablet sitting in a museum vault in Istanbul are directions. Real directions. Three landmarks pointing to a real location on a real map. And when a Soviet geological team followed those directions in 1967, they found something 1,500 meters underground that got the entire site classified, sealed shut, and buried in archives for fifty years. The tablet is still there. The cave is still sealed. And what's carved on the walls down there shouldn't exist.