A secretive, technologically advanced population might be residing on Earth, according to a new paper by researchers from Harvard and Montana Technological University.

These researchers speculate that “unidentified anomalous phenomena” (UAP), commonly known as UFOs, could be existing underground, on the moon, or even mingling with humans.

While acknowledging that their hypotheses might be met with skepticism by the broader scientific community, the researchers assert that these ideas merit “consideration in a spirit of epistemic humility and openness.”

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The paper explores the concept of “cryptoterrestrials” as a potential explanation for the numerous unidentified and unexplainable sightings reported globally each year.

#### Theories Proposed in the Paper:

- An ancient civilization's “remnant form” still exists on Earth.

- An intelligent species evolved separately from humans and remains hidden.

- Cryptoterrestrials are beings from another time period or planet.

- These unidentified entities are of supernatural origin, akin to “earthbound angels.”

The paper also entertains the idea that cryptoterrestrials might reside in or near hotspots for sightings, such as lakes and volcanoes. The recurring sightings in these areas could be due to entry and exit points for these hidden societies within the Earth. Additional potential settlements could be on the moon.

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In late 2023, David Grusch, a career intelligence official, claimed that the U.S. government has been concealing UFO research programs from the public. The government has consistently denied such claims.

The researchers' paper discusses the government's handling of sightings, noting that many believers think federal agencies are “deliberately downplaying the topic or at least obfuscating the extraordinary nature of many UAP-related events.”

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Despite the extraordinary nature of their claims, the researchers argue, “We entertain them here because some aspects of UAP are strange enough that they seem to call for unconventional explanations.”