Edgar Casey predicted the Hall of Records would be found under the right front paw of the Sphinx. Using the Hopi Creation Story, now we have a reason why. I would think it would be Spider Woman’s tomb, as the Hopi Creation Story states that she would remain here on Earth just like the Nephew and as far as I know, no large female tomb has yet to be discovered.
In my mind, I can visualize the people of the third world entering the Valley temple, going through the causeway into the Mortuary temple and finding their way into the pyramid for protection during the third worlds destruction.
After the destruction, the chosen would come out of the pyramid into the main chamber of the Mortuary temple and go underground to the naval of the Sphinx temple and emerge (re-birth) into the fourth world heading east.