In a recent essay published in The Debrief, philosopher Dr. Bernardo Kastrup (known for his outspoken defense of philosophical idealism which he calls "analytic idealism", and his criticisms of philosophical materialism) proposes to argue, rationally, for a seemingly surprising thesis regarding what some UAP could be: advanced nonhuman but terrestrial technology. Dr. Kastrup does this by arguing that the best and most credible evidence for UAP is plausibly explained by the so-called "Silurian Hypothesis", which references a hypothetical advanced, intelligent nonhuman yet terrestrial species.

While this thesis is obviously controversial (many would balk at the very idea), and has indeed been suggested before in the UAP/UFO literature, Dr. Kastrup argues in his essay that, given the credibility of many of the more recent UAP witnesses and their testimony, which in some cases can be corroborated by other physical observations (say, on radar), it "seems more productive, at this point, to…