Aliens Living Inside Earth?

Billions of years ago, a planet collided with Earth, possibly creating the Moon and introducing alien life. What remnants of this planet exist today? Could there be advanced humanoid aliens living within Earth's surface in subterranean cities? Transcript and sources: What If Aliens are Living Inside Earth? Questions or concerns? Contact us at Underknown Get our 100 best episodes in one mind-blowing book: The What If 100 Join this channel to get access to perks: Join Check out our other shows: How to Survive: Show Link Your Body on: Show Link Crazy Creatures: Show Link Watch more what-if scenarios: Planet Earth: Earth The Cosmos: Cosmos Technology: Technology Your Body: Body Humanity: Humanity T-shirts and merch: What If Store Suggest an episode: Suggest What If Newsletter: What If Newsletter What If elsewhere: Instagram: Instagram Discord: Discord Twitter: Twitter Facebook: Facebook What If in Spanish: Spanish What If in Mandarin: Mandarin Podcast: Podcast What If is a mini-documentary series exploring hypothetical worlds and possibilities. Dive into adventures through time, space, and chance, simplifying complex subjects in an entertaining way. Produced with love by Underknown in Toronto: Underknown Contact us at Contact Us 00:00: Could aliens be living deep inside of Earth?00:41: Protoplanet Theia striking Earth and creating the Moon.01:51: The different layers of Earth and Hollow Earth theory.03:02: What would the life conditions deep inside of Earth be? #Aliens #Earth #Theia #HollowEarth #AncientAliens #subterraneancities #humanoidaliens See show notes: https://inlet.fm/what-if-science-theories-possibilities/episodes/681d866ce64c4b83e7e51885 Learn more about your ad choices. Visit podcastchoices.com/adchoices