in the 9th century

The video uses historical imagery and a narrative about the discovery of the Great Pyramid's entrance, which is inherently interesting to a broad audience. The use of on-screen text and a clear, concise explanation makes the information easily digestible.

This video discusses the discovery of the Great Pyramid's entrance in the 9th century by Caliph Al-Mamun. His team used sledgehammers to break through the stone, eventually finding a cavity and internal passageways.