Cave Complex Allegedly Found Under Giza Pyramids Rossella Lorenzi - Discovery News - Aug. 13, 2009 An enormous system of caves, chambers and tunnels lies hidden beneath the Pyramids of Giza, according to a British explorer who claims to have found the lost underworld of the pharaohs. Populated by bats and venomous spiders, the underground complex was found in the limestone bedrock beneath the p…