"There is a civilization of people living in the centre of the Earth which is known as Agartha. To begin with, Buddhist theology affirms its existence. It is believed to be a race of supermen and superwomen who occasionally come to the surface to oversee the development of the human race and contact certain people in order to instruct them. It is also believed that this subterranean world has millions of inhabitants and many cities."
http://www.thehealersjournal.com/2011/11/06/intraterrestrials-shamballa-agartha-other-cities-of-light/
"The idea that the Forbidden Kingdom of “Agartha” actually exists was not only said to have been supported by Admiral Byrd but by other explorers around the world. A Map made by cartographer Heinrich C. Berann is believed to show an entrance to the inner Earth, the Kingdom of Agartha."
https://www.ancient-code.com/the-forbidden-land-of-agartha-the-secrets-of-the-inner-earth/
"Agartha (sometimes referred to as Agartta, Agharti or Agarttha) is a legendary city that is said to reside in the Earth's core. Shamballa (also known as Shambalah or Shangri-La) is sometimes said to be its capital city. The mythical paradise of Shamballa is known under many different names: It has been called the Forbidden Land, the Land of White Waters, the Land of Radiant Spirits, the Land of Living Fire, the Land of the Living Gods and the Land of Wonders."
https://www.tokenrock.com/explain-agartha-195.html
"Hidden worlds beneath the surface of the earth figured prominently in ancient beliefs. Central Asian Buddhists spoke in muted tones of the kingdom of Agartha (also spelled Aghartha), made up of a worldwide labyrinth of subterranean passages."
https://www.hollowearthresearch.org/proof-of-agartha
"Agartha, (sometimes referred to as Agartta, Agharthi or Agarttha) is a legendary kingdom that is said to flourish under us. The kingdom is basically said to sit within the earth and be there instead of the core we all presume exists. It is an enormous kingdom that stretches under the entire surface of the earth, through an elaborate system of tunnels that connect across the globe and under it."
https://theconlblog.com/2020/09/agartha-the-hidden-kingdom/
"Agartha (sometimes Agartta, Agharti or Agarttha) is a legendary city that is said to reside in the Earth's core. It is related to the Hollow Earth theory and is a popular subject in Esotericism. Agartha is one of the most common names cited for the society of underground dwellers. Shamballa (also known as Shambalah or Shangri-La) is sometimes said to be its capital city."
https://www.crystalinks.com/agartha.html
"The inhabitants of Agartha are said to be a benevolent human species, that have technological capabilities that exceed ours by far. E.g., they have a space fleet that is called the 'Silver Fleet.'
The Agartha Network should not be confused with another underground network of (military) bases that allegedly is inhabited by 'Reptilians,' Greys, Members of the Draconian Empire, and Secret Government people, with whom the inhabitants of Agartha are said to have been in conflict for a long time. They even lost some of their cities to them."
https://www.exopaedia.org/Agartha
"Agartha, it is said, was not always underground and will not always remain there. A time will come, according to the writings of M. Ossendowski, when those who live in the communities of Agartha will leave their caverns and return to the surface."
http://www.rosicrucian-order.com/revista_agartha.htm
"Agartha is a legendary city known to reside deep inside our planet. Also known by the names Agartta, Agharti or Agarta, it is often associated with Shambhala (a mythical kingdom, mentioned in various ancient texts such as Vishnu Purana, stating it to be the birthplace of Kalki) as the capital city of Agartha."
https://procaffenation.com/know-forbidden-land-agartha-myth-hidden-truth/