There's a canyon beneath the Nile River at Cairo that runs 8,000 feet deep. That's deeper than the Grand Canyon by 1,500 feet. If you could remove all the sediment filling the channel today, you'd be staring down into a sheer-walled gorge carved right beside the Giza Plateau. The scale is staggering, and the implications for how and when this feature formed raise fundamental questions about the history of the Nile valley and the surrounding landscape.
This isn't speculation. It's measurable geology. The canyon is there, buried under millennia of alluvium. What kind of event or prolonged process could carve a feature of that magnitude? And what does its proximity to one of the most studied archaeological sites on Earth tell us about the timeline we've been working with? The evidence is in the ground. We just have to be willing to look.