In March of 1993, respected German engineer Rudolf Gatenbrink used a remote controlled robot named Upuaut II , carrying a video camera, among other sensory devices, to explore the 8" square southern air shaft leading from the "Queen's Chamber" in the Great Pyramid. His work, sanctioned by the Egyptian authorities, led to the discovery of a blocking or closure stone (the media called it "Gatenbrink's Door") two hundred feet up the shaft, penetrated by two pieces of copper with broken or melted ends showing. Egyptian archaeological authorities say this is a "door" and they say   the protrusions are "handles".
The left photo is of the "door" and its copper protrusions and to the right a closeup of the leftmost copper protrusion.

Remember, this is an 8"  square shaft, (20cm) making the copper protrusions about a half-inch (13mm) diameter.


By the "Occam's Razor" principle (i.e. the simplest explanation is probably the best) the "handles" look like broken-off or melted insulated power cables.
Personally, I can think of NO OTHER REASON for a pair of half-inch copper cables to be embedded in a stone block and run through a dry channel to an interior chamber other than as a conductor for ELECTRIC POWER. The dark residue at lower right corner of stone block provides plausible evidence of a metal ground strap running along the juncture of wall and floor. Perhaps there was, originally, a generator of some sort elsewhere in, or on, the pyramid, or perhaps the pyramid device was lightning powered. The TV show about this being a "door"  is an attempt to sweep this under the rug, so to speak.   Giza authorities (under the direction of Zahi Hawass) like to keep our attention safely focused on "mummies".

SEE GATENBRINK WEBSITE FOR TOTAL DETAILS AND PHOTO-DIAGRAMS ABOUT THE CONSTRUCTION OF THIS SMALL SHAFT IN THE GREAT PYRAMID

COPPER PROTRUSIONSPhotos©R.GatenbrinkINSULATED COPPER CABLE

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