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{{Short description|Concept developed by ufologists}}
The '''cryptoterrestrial hypothesis''', also referred to as '''[[wikt:intraterrestrials|intraterrestrial]]''',<ref>{{cite journal |last1=Whitesel |first1=Brad |title=Walter Siegmeister's Inner-Earth Utopia |journal=Utopian Studies |date=2001 |volume=12 |issue=2 |page=92-93 |jstor=20718317 }}</ref> or '''inner-earth''',<ref>{{cite book |last1=Clark |first1=Jerome |title=Extraordinary Encounters An Encyclopedia of Extraterrestrials and Otherworldly Beings |date=2000 |publisher=[[ABC-Clio]] |location=Santa Barbara, California |isbn=1-57607-249-5 |page=123, 153 |url=https://ia802901.us.archive.org/19/items/ExtraordinaryEncounters_201809/Extraordinary%20Encounters.pdf |access-date=December 11, 2023}}</ref> proposes that [[Unidentified flying object|unidentified flying objects]] are a sign of a [[Technological singularity|technologically]] advanced population living on Earth alongside humans.<ref>{{cite news |last1=Kutz |first1=Anna |title=Hidden UFO civilization could be on Earth: Harvard researchers |url=https://www.newsnationnow.com/space/ufo/ufo-uap-hidden-society-harvard-paper/ |access-date=June 13, 2024 |agency=[[NewsNation]] |date=June 11, 2024}}</ref><ref>{{cite news |last1=Riley |first1=Neal |title=Aliens could be "walking among us" on Earth, Harvard researchers suggest |url=https://www.cbsnews.com/boston/news/ufos-aliens-harvard-uap-cryptoterrestrial-hypothesis/ |agency=[[CBS]] |publisher=[[CBS News]] |date=July 2, 2024}}</ref><ref>{{cite web |last1=Tangermann |first1=Victor |title=Harvard Scientists Say There May Be an Unknown, Technologically Advanced Civilization Hiding on Earth |url=https://futurism.com/harvard-scientists-unknown-civilization-cryptoterrestrials |publisher=[[Futurism (disambiguation)|Futurism.com]] |access-date=June 13, 2024 |date=June 11, 2024}}</ref> The idea has been around since the beginning of the [[20th century]]
This hypothesis is considered [[pseudoscientific]] in nature, just like the disciplines concerned with its study such as [[Cryptozoology|cryptozoology]] and [[Identification studies of UFOs|ufology]]. Furthermore, in spite of its early popularity, the concept that UFOs could be indigenous to planet Earth is considered unconventional even amongst ufologists.<ref>{{cite book |last1=Tonnies |first1=Mac |title=The Cryptoterrestrials - A Meditation on Indigenous Humanoids and the Aliens Among Us |date=March 2010 |publisher=Anomalist Books |isbn=9781933665467 |pages=35 |edition=1st |url=https://avalonlibrary.net/ebooks/Mac%20Tonnies%20-%20The%20Cryptoterrestials.pdf |access-date=Jan 10, 2024 |quote=This book documents a most unconventional slant on the enduring UFO mystery.}}</ref><ref>{{cite book |last1=Lomas |last2=Masters |last3=Case |first1=Tim |first2=Brendan |first3=Michael |date=Jan 7, 2024 |title=The cryptoterrestrial hypothesis: A case for scientific openness to a subterranean earthly explanation for Unidentified Anomalous Phenomena |via=[[ResearchGate]] |doi=10.13140/RG.2.2.31670.27208/1 |doi-access=free |edition=Preprint}}</ref><ref>{{cite web |last1=X |first1=Ram |title=UAP and the Trickster Phenomenon |date=July 2023 |url=https://forteanwinds.com/2023/07/01/uap-and-the-trickster-phenomenon/#:~:text=Trickster%20phenomenon%20as%20a%20strategy%20or%20pastime%20of%20a%20crypto%2Dterrestrial%20species |publisher=Fortean Winds |access-date=Jan 22, 2024|quote=However, there is also a third minority class of hypothesis: an unconventional terrestrial explanation, outside the prevailing consensus view of the universe}}</ref>
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