The Upuaut Project was a scientific exploration of the so-called "air shafts" of the Great Pyramid of Cheops at the Giza Plateau, which was built as a tomb for Fourth Dynasty pharaoh Khufu. It was managed by Rudolf Gantenbrink during three campaigns (two in 1992 and one in 1993). It involved sending a miniature mobile robot up the two shafts.
The Upuaut Project was the subject of a television documentary.
The project resulted in the finding of a "sealed block" at the end of the air shaft.
The research at the Great Pyramid is currently continued by the Djedi Project managed by experts of the Leeds University.
References
The Upuaut Project Wikipedia(Text) CC BY-SA