Egypt: The 25 granite boxes were found on Tuesday just 12 miles south from the Great Pyramid of Giza in the ancient necropolis of Saqqara near Memphis in Lower Egypt.

UFO (Unidentified Flying Object) hunters believe the high precision of engineering of each of the black stone boxes is significant and remarkable, even by 21st century standards.

UFO and alien theorist Brien Foerster said: ‘The precision is very 21st century, or at least 20th century.’ He also claims that the precision of construction of the surfaces of stone boxes, which are 100-tonnes with 30-tonne lids, and the angles are ‘within a few ten thousandths of an inch’. It is not known how the ancient Egyptians had the technology to make the skilfully cut stone boxes – leading UFO researchers to suggest they were designed and constructed by aliens that visited the country.

But some say that it should not surprise anyone that the ancient Egyptian engineers were capable of such remarkable engineering feat.

Attempting to explain the purpose of the boxes, some Egyptologists suggested that they were intended to hold the mummified remains of the sacred bulls. But none of the boxes contained mummified remains of the sacred Apis bulls. UFO believers insist they must have been built to hold the mummified remains of giant humanoid aliens who never used them, possibly because they left Earth before they died.