Scientists have discovered that one of the world's greatest enigmas just got more mysterious.
Earlier this year, researchers from Italy and Scotland claimed they uncovered huge underground chambers and shafts more than 4,000 feet beneath the Pyramids of Giza.
Using radar technology, the team sent 'high-frequency electromagnetic waves' into the subsurface and analysed how signals bounced back to map structures using a 'specialised algorithm.'
They said their findings could point to a hidden underground city beneath Egypt’s most iconic landmarks.
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However, several experts outside the experiment were quick to dismiss the discovery as a 'huge exaggeration' with 'no basis in truth.'
Additionally, the research is yet to be peer-reviewed or published in a scientific journal.
However, the findings have reignited a long-debated theory that another advanced civilisation may have helped shape early Egyptian history.
Now, geologist Dr. James Kennett suggests geological evidence that Egypt may have experienced catastrophic flooding caused by a comet strike thousands of years ago.
He points to Abu Hureyra in Syria - about 1,000 miles from Giza - where scientists found material from a potential ancient impact.
"There is evidence of a major population decline in North America beginning at 12,800 years ago," said Kennett at the University of California Santa Barbara. "That lasted a few hundred years, and then they started to come back - but as a different culture."
If debris hit nearby regions, it could have triggered severe flooding from the Mediterranean Sea and Nile River, washing over ancient Egypt, Kennett described. Oddly enough, this matches up with certain flood myths in Egyptian history.
Analysing hieroglyphs within the Temple of Edfu - 780 miles south of Giza - author and researcher Andrew Collins talked about a devastating flood that wiped out a mysterious civilisation known as the 'Eldest Ones.'
According to Collins, the inscriptions describe a 'sacred domain' in the Giza region that was destroyed by an 'enemy serpent' - possibly a metaphor for such celestial disasters.
He also highlights the mention of a hidden chamber called the 'Underworld of the Soul', which he thinks could connect to underground structures in the Giza area. "This I am sure relates to Giza's cave system and any structures it may contain," Collins added.
However, mainstream archaeologists disagree and argue that the Edfu inscriptions are purely symbolic and mythological - with no solid evidence they refer to Giza at all. In their view, the story describes gods arriving in Egypt after a flood, not coming from the area initially.