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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 as a subset the “cryptoterrestrial” hypothesis, namely the notion that UAP may reflect activities of intelligent beings concealed in stealth here on Earth (e.g., underground), and/or its near environs (e.g., the moon), and/or even “walking among us” (e.g., passing as humans). Although this idea is likely to be regarded sceptically by most scientists, such is 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. [ABSTRACT FROM AUTHOR]

Recent years have seen increasing public attention regarding unidentified anomalous phenomena (UAP). Hypotheses for such phenomena tend to fall into two classes: a conventional terrestrial explanation (e.g., human-made drones), 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 life and the universe. This is the "ultraterrestrial" hypothesis, which includes - but is not limited to - the "interdimensional" hypothesis, namely the highly speculative notion that UAP may reflect activities of beings from other dimensions that coexist alongside our own. Such hypotheses may rightly be regarded with scepticism by most scientists. However, this article suggests they nevertheless should not be ruled out, and deserve serious consideration in a spirit of epistemic humility and openness. [ABSTRACT FROM AUTHOR]