Right, I've read about how the Smithsonian had systematically disappeared a huge amount of archaeological evidence that supports the Bible against the evolutionists.
Quayle wrote a book called The Great Smithsonian Cover-up.
This is a 2018 interview with him by George Norey.
https://www.coasttocoastam.com/show/2018-08-21-show/Tuesday - August 21, 2018
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About the show
In the first half, author and researcher
Steve Quayle argued that there's been a cover-up at the Smithsonian Institution of ancient artifacts, including giant remnants, and evidence of an Egyptian presence in the Grand Canyon and the Americas circa 250 BC (view
related material). Anthropologist John Wesley Powell, an influential 19th-century director of the Museum, was instrumental in keeping "out-of-place" artifacts from the public eye, he said. Quayle recently interviewed an eyewitness (identity disguised in video) who claimed he was shown secret storage facilities of the Smithsonian containing giant skeletons and Egyptian artifacts including mummies. There are literally "tens of thousands of items" not just from the Grand Canyon, but the Pacific Rim, and different burial mounds that the Smithsonian wants to keep quiet, Quayle added.
The source had security clearance and saw the artifacts 20 years ago, traveling down four levels, and was also told of items not shown. The finds have been kept secret, he continued, because they would deliver a blow to Darwinism, and reveal the presence of the fallen angels or the Nephilim. The giants were half-human and half-fallen angel, he suggested, and helped build ancient megalithic sites with huge stones. Will the DNA of ancient giants become the super-soldiers of tomorrow? Quayle pondered. He believes that eventually demonic disembodied spirits of the giants will inhabit machines.