I remember this being published in the late 80’s, but have not heard of any follow-ups since:
"1988 - Egypt, Giza Plateau, Great Pyramid
Professor Sakuji Yoshimura along with a team of Japanese scientists conduct experiments in the Queen’s Chamber using electro-magnetic waves and radar equipment.
This high-tech approach yielded results similar to the French (1986). With the confirmation of a ‘cavity’–some believe a hidden chamber possibly containing the treasures of Cheops–close to the French team’s drillings, they found another large cavity behind the N-W wall of the inner Queen’s Chamber and a ‘tunnel’–possibly passageway–outside and to the south of the Great Pyramid.
Shortly after these intriguing discoveries, the Egyptian authorities stepped in and terminated Yoshimura’s work."
Has anyone heard of this work being followed up?
“Fingerprints of the Gods” style speculation aside, why on earth has no one investigated this in over 15 years?