I believe the Great Hall of Records was Found.

[guohua]

I think they found the entry in the 1990's and that Egyptian Mafia, Lead by Dr. Zahi Hawass keeps it hidden.
They don't want the average citizen to know what is down there.
Why?

Hawas is mafia. Agreed. Not sure about the "hall of records". It's kinda like a wet dream for me. Unfortunately, as long as the "authority" does not admit to anything, it's always in the realm of speculation and shelved as a "conspiracy theory". I hate that shit.

I Agree, I Hate That Shit Too!  
Makes us all look like Conspiracy Nutz when we know something is being hidden from the World and WE Know It Is There!