Agartha

Agartha is a purported mythical realm located underneath Kern on the inside of the hollow earth. To enter it, supposed passageways on the earth's surface leading deep through the earth's crust eventually reach down onto the floor of Agartha, at which point gravity reverses, and as such the entire realm is upside-down from the surface's perspective.

No adventurer group or expedition led by academia has ever located a real entrance to Agartha in modern times, but its existence is attributed to the works of dozens of historians, poets, and cartographers from diverse geographic locations during antiquity.

Features

Agartha is almost always described as being a hyper-advanced, utopian civilization inhabited by humanlike creatures underneath a bronze sun. Due to the realm's location, it is permanently daytime, so their inhabitants have adapted beyond the need to sleep. While most works described the inhabitants as "giants", certain historians from later times after many works on Agartha already existed coined the term "nephilim" to described this legendary race.

Historians described nephilim as a much larger, physically-powerful, and extremely-intelligent species that very similarly resemble humans, only with longer faces, wider hands, and extremely long limbs. One of the most notable works from antiquity about Agartha is a poem detailing the individual nephilim who created Agarthan Mortar, a being known as Gilgamesh, which is known colloquially by those who have studied it as antimagic concrete.