Trevor Grassi is an independent researcher, world traveler, writer and filmmaker who has been studying and searching for the Hall of Records at Giza for nearly two decades. In the past few years he has worked closely with civil engineer and 'Gizatologist', William Brown, at Giza to reveal evidence of underground structures very close to the Sphinx and throughout the plateau. They have shared never-before-seen ground penetrating radar scans, photos, videos, and personal accounts of the subterranean network of tunnels and chambers that are likely connected to the record chambers described by Edgar Cayce. They are planning an excavation project at the most promising locations in the near future, and have released a three part documentary series entitled The Secret Underworld of Giza.