Recent years have seen increasing public attention and indeed concern regarding unidentified anomalous phenomena (UAP). Hypotheses for such phenomena tend to fall into two classes: a conventional terrestrial explanation (e.g., human-made technology), or an extraterrestrial explanation
(i.e., advanced civilizations from elsewhere in the cosmos). However, there is also a third minority class of hypothesis: an unconventional terrestrial explanation, outside the prevailing consensus view of the universe. This is the “ultraterrestrial” hypothesis, which includes the “cryptoterrestrial”hypothesis, namely the notion that UAP may reflect activities of intelligent beings concealed in stealth here on Earth (e.g., underground, or even “walking among us” disguised as humans) and/or its near environs (e.g., the moon). Although this idea is likely to be regarded sceptically by most scientists, such are the nature of some UAP that we argue this possibility should not be summarily dismissed,and instead deserves genuine consideration in a spirit of epistemic humility and openness.

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