John Romer, the Egyptologist and broadcaster, says he believes cliffs on Luxor's west bank contains the burial site of three priest kings: Herihor, Plankh and Menkheperre.
It's also claimed that burial treasures from nearby sites in the Valley of the Kings were placed here for safekeeping.
However, the site is in danger and the race is on to save it from tomb raiders using quad bikes and rope ladders, the Sunday Times reports.
"Last week, three people were arrested by the army security services at Luxor for entering it," said Romer.
The project is the culmination of 40 years' work for Romer. But he may be beaten to the prize as he needs to secure a permit from Egypt's Supreme Council of Antiquities to continue his search.
It's a race against time as there is a rival expedition already excavating in the area.
"I still hope to explore it but the only important thing in my life now is that it is done properly," Romer says.
Watch the video with John Romer explaining his new discoveriesSource: IBT