"Byrd apparently informs readers of having entered into the hollow interior of the earth, along with others and having traveled 1700 miles over mountains, lakes, waterways, green vegetation, and animal life. The outside temperature recorded was 74 degrees F.
His airplane was welcomed by machines of a type he had never actually seen before. His hosts informed him that he had actually been allowed to enter Agartha (their term for the hollow earth)"
https://www.hollowearthresearch.org/admiral-byrd-and-the-hollow-earth
Secret Space UFOs: Rise of The TR3B (OFFICIAL TRAILER)
"The legendary TR3B is said to be the very first Alien Reproduction Vehicle that the military built secretly for space travel."
"The mission, known as Artemis I, will pave the way for a future flight test with crew before NASA establishes a regular cadence of more complex missions with astronauts on and around the Moon under Artemis."
https://www.nasa.gov/feature/nasa-fully-stacked-for-moon-mission-readies-for-artemis-i
"Agartha (sometimes referred to as Agartta, Agharti or Agarttha) is a legendary city that is said to reside in the Earth’s core.
The capital city of Agartha is known as Shamballa, but sometimes known as Shambalah or Shangri-La."
https://www.tokenrock.com/subjects/agartha/
"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.
Also, there are some very interesting and beautiful stories about people who allegedly traveled to this world. The realm is commonly known as Agartha, and the third tunnel was probably leading straight to it. It only makes sense that the shadow elite were not interested to make the discovery known to the people."
https://bucegimysteries.wordpress.com/2017/02/06/anunnaki-base-discovered-in-the-bucegi-mountains-the-giant-aliens-that-created-mankind/