Could Khufu’s remains…remain?
This whole thing is sdomewhat complex. From what I’ve read, Gantenbrinck isn’t trained as an archaeologist, but is a robotics engineer (Not that this is a put-down; I admire his zeal and stepping outside his field and trying to negotiate the minefields of wiorking in a different discipline with the difficulties of media coverage and other such business). He started his “Upuat” investigations over a decade ago, and there has been some controversy and confusion about how things were done. His own web page is here: http://www.cheops.org/ . Robert Bauval and Graham Hancock write about him a lot, and I suspect that colors a lot of peoples’ thinking about him.
In any event, IIRC, his robots went up so-called “ventilation shafts” in the pyrmids and found at least one “hidden chamber”. But from the TV footage i’ve seen this is a pretty smal door fronting what is probably a pretty smasll “chamber” well up the shaft. I find it hard to believe there’s a burial up there, although I can believe that there may be a repository of small items.