One of Lyne's most startling claims is that UFOs are terrestrial in origin. He suggests:

Have you ever wondered if the "flying saucers" reported in our skies are not extraterrestrial visitors, but secret man-made craft powered by a forgotten science? In his provocative book Occult Ether Physics , William Lyne argues exactly that. This 4th Revised and Expanded Edition dives deep into the suppressed theories of Nikola Tesla and a global conspiracy designed to keep humanity tethered to archaic energy sources.

The following blog post explores the controversial and fascinating world of Occult Ether Physics: Tesla’s Hidden Space Propulsion System and the Conspiracy to Conceal It (4th Revised and Expanded Edition) by William Lyne.