Under the Sphinx, therefore, there may be a tunnel. Area east of the Sphinx (Near forefeet of the Sphinx) The front of the Sphinx consists of pieces of limestone that have been arranged artificially and paved. There is no evidence to indicate that the Hall of Records ever existed. The Hall of Records is an ancient library claimed by Edgar Cayce to lie under the Great Sphinx of Giza, which is in the Giza pyramid complex.. Further, near the front elbow, a geometrical cavity (1m x 1.5m x 7m) has been detected, possibly containing metal or granite. SECRET chambers hidden below the Great Sphinx of Giza could lead to undiscovered treasures, a top historian has claimed.