According to the "Hollow Earth" theory, the Nazis, who managed to escape arrest after World War II, and the aliens - "Guardians" live in the center of the Earth.
Following the "Flat Earth" theory, the "hollow earth" theory is rapidly gaining its supporters.
They believe that instead of magma, our planet has huge voids inside.
At the heart of the conspiracy theory is the claim that NASA is hiding evidence of a large ground-level discovery, leading to a cavernous world below, according to Dailystar.co.uk.
Theorist and ardent supporter of this theory Rodney Cluff even wrote the book "Top Secret: Our Earth is Hollow."
He mercilessly criticized the followers of the Flat Earth theory, accusing them of being "grossly mistaken."
He said, "I don't know how Flat Earths can be so confused."
Mr. Cluff claims that the Earth's shell is only 800 miles thick and that there is an inner sun at the center.
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He says that the "superior" race of alien people who consider themselves "guardians of the planet" live in the center of the Earth.
Mr. Cluff states: “They regularly track us using spacecraft and flying saucers.
"Most UFOs really come from our planet."
Most Hollow Earth devotees believe that there are three entrances to the inner Earth: two near the poles and one in the Himalayas.
The theory has its origins in ancient Greek, Buddhist and Christian faiths. She began to collect during the 1700s.
In the 18th century, astronomer Edmond Halley expressed his opinion that unusual compass readings can be explained by the fact that the planet is hollow.
North Pole explorer Olaf Jansen claimed to have swum through the entrance to the center of the Earth in 1811.
He told author Willis George Emerson that they had lived in the beautiful "City of Eden" for two years, visiting "supermen who were over 12 feet."
As the theory began to grow, so the assumptions became whiter and more original.
So it was suggested that, in addition to aliens, there are surviving Nazis who fled to Antarctica, where they met with a group of aliens and worked together on UFO technology. From there they moved closer to the Center of the Earth.
Others said that the Viking colonies from Greenland were also there.
Some believe that the real "Garden of Eden" exists at the core of our planet.
Conspiracy theorists said last year that a photograph of Earth proved NASA was hiding a huge hole leading directly to the center of the planet.
There is also a separate theory that claims that the Moon is also hollow and that it is a huge artificial alien space station.
Of course, there is no real evidence to support the existence of any base for aliens or Nazis in the center of the Earth or Antarctica.
