"In 1939, Captain Alfred Ritscher of Nazi Germany found the Antarctica Entrance into the Inner Earth."
https://robscholtemuseum.nl/wes-penre-thule-gesellschaft-and-the-vril-society-funkenfilme-exemtum/
"The Imperial Germans are the Germans that live in the Inner Earthen colony of New Swabia."
http://imperialgermans.com/
Macuxi Indians claim Earth is Hollow and inhabited by “Giant Creatures”
https://www.monkeyandelf.com/macuxi-indians-claim-earth-is-hollow-and-inhabited-by-giant-creatures/
"XX. The Third Tunnel — A Secret World
The middle tunnel was the most important to both Lord Massini and the U.S. Government, which strongly requested to be kept secret to the public. This tunnel descended to extreme depths towards a veritable underground world, located near the center of our planet.
Those of you who are not familiar to the hollow earth theory, please note that there are important figures who support the theory that all planets are probably hollow on the inside, and bring interesting scientific arguments to support their claims."
https://bucegimysteries.wordpress.com/2017/02/06/anunnaki-base-discovered-in-the-bucegi-mountains-the-giant-aliens-that-created-mankind/
"There's an ancient mystery of connected tunnels across the world... could these paths lead to the legendary Hollow Earth kingdom Agartha deep under the Himalayas?"
"The Admiral also said that the South polar expedition is “the most important in the history of the world.” On January 13, 1956 the Admiral and his crew flew 2,300 miles over land beyond the South Pole and Byrd said he saw a “different type of land.” He said that he thought it would only be snow and ice but was surprised to see “endless land, mountains, forests, and a large mammoth animal.”"
https://stephwynne.medium.com/is-there-land-beyond-the-south-and-north-poles-not-on-our-maps-the-man-who-knew-too-much-2781a6b0af5b
"The concept of Shambhala plays an important role in Tibetan religious teachings, and has particular relevance in Tibetan mythology about the future. The Kalachakra prophesies the gradual deterioration of mankind as the ideology of materialism spreads over the earth. When the “barbarians” who follow this ideology are united under an evil king and think there is nothing left to conquer, the mists will lift to reveal the snowy mountains of Shambhala. The barbarians will attack Shambhala with a huge army equipped with terrible weapons. Then the king of Shambhala will emerge from Shambhala with a huge army to vanquish "dark forces" and usher in a worldwide Golden Age."
https://www.ancient-origins.net/ancient-places-asia/mysteries-kingdom-shambhala-001529
"Earth consists of three main layers: the crust, the mantle, and the core (Figure 3.4). The core accounts for almost half of Earth’s radius, but it amounts to only 16.1% of Earth’s volume. Most of Earth’s volume (82.5%) is its mantle, and only a small fraction (1.4%) is its crust."
https://openpress.usask.ca/physicalgeology/chapter/3-1-earths-layers-crust-mantle-and-core-2/