Here evidently is the paper: https://www.researchgate.net/profile/Tim-Lomas/publication/381041896_The_cryptoterrestrial_hypothesis_A_case_for_scientific_openness_to_a_concealed_earthly_explanation_for_Unidentified_Anomalous_Phenomena/links/665e2620479366623a3dbaeb/The-cryptoterrestrial-hypothesis-A-case-for-scientific-openness-to-a-concealed-earthly-explanation-for-Unidentified-Anomalous-Phenomena.pdf
But you can "Engage Tent Mode on your vehicle's touchscreen for an enhanced camping experience"!