This is an excellent interview with the two researchers who did the paper on the Underground Pyramid structures. The PHD Engineer who developed the process talks for about 40 minutes about the process and tries to explain it to a lay person (though that’s hard for him, because he is a technical scientist). About one hour in, he provides more details with frequencies and the like. He also mentioned that they surveyed an underground lab and the Tomb of Osiris first (which were known), and scanned other structures. He also said the basic information is available so that the public can experiment with it; it is his exact program that he patterned.
I’m going to the live-stream of the conference in North Carolina, where they will be speaking, and I will see if I can suggest the Mine in South Dakota for them to look at. However, they may have started getting contracts for projects elsewhere in South America.
Honestly, his partner is not on the technical side but more on the esoteric side, even if he says he is a historian. But it is the PHD scientist and sound engineer who is the most interesting in the context of “Could this be real?”
Anyway, most Gizers will want to listen. The panel includes Randal Carlson, who speculates that there may be natural limestone caves under the Giza Complex, which, if the basic opening was already there, could have made it easier for ancient people to use and modify structures that deep.
Here is the link - run time 1 hour and 19 minutes (important stuff at 40 minutes and 60 minutes)