Things like this happen every year, thanks to both the tomb building tradition and the climate of the region.

Middle kingdom did thrive about 4k years ago, this is the height of the classic Egyptian culture. Numerous tombs were escavated already.

Thr comment you replied to reasonably noted how the culture survived for 2.7k years. They kept track of every pharaoh they had, as well as dynasties, and key events.

This is amazing. Not the boring tomb. Although I love tombs.