The mystery of an 'underground city' beneath Egypt's pyramid deepens as scientists have shared new details about what may lie more than 4,000 feet below the surface. A team of Italian researchers claimed they uncovered giant vertical shafts wrapped in 'spiral staircases' and a massive limestone platform containing two enormous chambers with descending channels resembling pipelines. >>> While the bombshell claims have been dismissed by other experts as 'false' and 'exaggerated,' the team believes there is 'an entire hidden world of many structures' more than 2,000 feet below the water system 'When we magnify the images [in the future], we...