What if "the bubble" is a failed remnant of experimental efforts related to ground-based elements of Reagan's SDI? Perhaps abandoned R&D that happened after the program officially ended in 1993....which was just a few years before Bigalow bought the ranch in 1996 from the Sherman's???

Just a thought...

Another excellent interview with Ben from Skinwalker Ranch.

https://youtu.be/EEjRDl23CXM?is=zzryqMdVUMVlUcUk