Cryptoterrestrial hypothesis (Ufology)
From Kook Science
The cryptoterrestrial hypothesis is a position in ufology that proposes UFOs constitute contact with beings that coexist separately from but alongside humanity on the planet Earth, in some cases emerging from the underground (e.g. deros) or simply otherwise concealed from humanity.
- Tonnies, Mac (2010), The Cryptoterrestrials: A Meditation on Indigenous Humanoids and the Aliens Among Us