[Darksheare]

Can't they search for hidden rooms using basically siesmic acoustic sensors?
Kinda like what oil prospectors use?
A bunch of pingers inside the pryamid send out a signal, and an array of sensors on the outside of the pyramid looks for the signal to be recieved.
Voids and rooms would leave gaps becaue the signal would be weaker from traveling from stone to air and back.

[Southack]

"In Egypt: Secret Chambers Revealed [2002], archaeologist and National Geographic Explorer-in-Residence Dr. Zahi Hawass and a team of engineers explored a mysterious blocking stone within the southern shaft of the Great Pyramid at Giza. During the program, a state-of-the-art robot, developed by iRobot in Boston, Massachusetts, traversed the length of the shaft, encountering a second blocking stone a mere 45cm beyond the first."

[SunkenCiv]

Some years ago (1987? I forget) a Japanese team thought they'd found at least one chamber, I think it was near the Queen's Chamber, and they were immediately kicked off the plateau. :')

George W. Bush will be reelected by a margin of at least ten per cent