ref: http://mail.architexturez.net/+/In-Enaction/archive/msg02881.shtml
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When the French team surveyed the Great Pyramid, they used
microgravimetry, a technique that enabled them to measure the density of
different sections of the pyramid, thus detecting hidden chambers. The
French team concluded that there were no large hidden chambers inside
it. If there was a ramp inside the pyramid, shouldn't the French have
detected it? In 2000, Henri Houdin was presenting this theory at a
scientific conference where one of the members of the 1986 French team
was present. He mentioned to Houdin that their computer analysis of the
pyramid did yield one curious image, something they couldn't interpret
and therefore ignored. That image showed exactly what Jean-Pierre
Houdin's theory had predicted--a ramp spiraling up through the pyramid.
Far from being just another theory, the internal ramp has considerable
evidence behind it. A team headed by Jean-Pierre Houdin and Rainer
Stadlemann, former director of the German Archaeological Institute in
Cairo and one of the greatest authorities on pyramids, has submitted an
application to survey the Great Pyramid in a nondestructive way to see
if the theory can be confirmed. They are hopeful that the Supreme
Council of Antiquities will grant permission for a survey. (Several
methods could be used, including powerful microgravimetry,
high-resolution infrared photography, or even sonar.) If so, sometime
this year we may finally know how Khufu's monumental tomb was built. One
day, if it is indeed there, we might just be able to remove a few blocks
from the exterior of the pyramid and walk up the mile-long ramp Hemienu
left hidden within the Great Pyramid.