Remember this? I was wondering what happened to this conspiracy just earlier today!
On November 2, 2017, an international team of around thirty-three scientists from the ScanPyramids project published the results of their two-year-long Great Pyramid research project in the journal Nature. Using a technique known as muon tomography (or simply muography), the ScanPyramids team set up their muon detectors inside and outside the Great Pyramid. Similar to x-rays, which are used to show different densities of matter within the human body, muons (which are by-products of cosmic rays) can be used to detect different densities of matter within solid rock, thus revealing areas where there are cavities or possible hidden chambers within the structure. The technology was first successfully used in the 1970s and since then has been used to probe the interiors of structures as diverse as volcanoes, glaciers, and even nuclear reactors.
The ScanPyramids project team was split into three separate groups, with each group working independently of the others using a different muography technique. All three groups reported identical findings with a confidence level of 99.9999 percent that the Big Void within the Great Pyramid truly is a real structural anomaly within the monument and not simply a statistical anomaly. In short, the scientists detected a massive space almost as large as, and a short distance above, the Grand Gallery of the Great Pyramid (fig. 1.2), a space that could turn out to be a truly massive hidden chamber.
It's pretty interesting. Dr. JPF points out that they're resonance cavities... Like for frequency.