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The research team managed to snag a set of muon detectors—called nuclear emulsion films—from their Japanese partners to observe muons bouncing around what they realized was a 100-foot-long cavity in the middle of the pyramid.

One type were nuclear emulsion films.

The exposure time for the nuclear emulsion film used around the Great Pyramid was measured in months.

One type of muon detector, called a nuclear emulsion film, catches muons as lines of little black globules.

Its telltale track through a sandwich of three dozen sheets of plastic, nuclear emulsion and photographic film looked unfamiliar to cosmic-ray researchers.