Mystical systems
Hollow Earth
Direct answer
Hollow Earth is the idea that the earth contains a vast inner space, perhaps inhabited and reached through openings at the poles, proposed as science in 1692 and long since set aside.
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At a glance
- Also called
- inner earth, symmes hole, is the earth hollow
- Found in
- Mystical Systems
- Related
- Agartha, Shambhala, Hyperborea, Atlantis
Hollow Earth is the idea that the earth contains a vast inner space, perhaps inhabited and reached through openings at the poles, proposed as science in 1692 and long since set aside.
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Is the Earth hollow?
The belief in a world beneath the ground is very old: most cultures have an underworld. The Hollow Earth as a physical theory is younger and can be dated. In 1692 the astronomer Edmond Halley suggested that the earth might consist of an outer shell and inner shells turning at different speeds, to account for the wandering of the compass needle. He even wondered whether the inner surfaces might be lit and lived on.
Later writers kept the hollow and dropped the reasoning. The American John Cleves Symmes declared in 1818 that the earth was open at both poles and asked for a ship to sail in. Novelists took up the idea, and in the twentieth century it merged with tales of hidden masters, underground kingdoms such as Agartha, and flying craft from within. The record gives it no support: no expedition, drilling or measurement has found such a cavity.
On the tree of the hidden arts: Lost worlds.
What sets Hollow Earth apart
The idea has had three distinct forms, and telling them apart clears most confusion. Halley's was a model in physics, shells within shells, offered to explain a measured effect and open to test. Symmes's was a geography, with rims at the poles that a ship could cross, offered with no measurements at all. The third is occult and literary: an inner realm of advanced beings, reached by tunnels. Only the first was ever a scientific proposal, and it was abandoned when better accounts of magnetism arrived.
- First scientific version: Edmond Halley, paper to the Royal Society, 1692
- Reason given: to explain slow changes in the direction of the compass needle
- Polar openings: John Cleves Symmes, Circular Number 1, April 1818
- Classic novel: Jules Verne, Journey to the Centre of the Earth, 1864
- Pulp revival: the Shaver Mystery in Amazing Stories, from 1945
- Deepest borehole: Kola, Russia: about 12 kilometres, reached in 1989
Often mistaken for something else: Agartha is a named kingdom from French occult writing of the nineteenth century; Hollow Earth is the wider physical claim, into which Agartha was later fitted.
The story behind Hollow Earth
Halley read his paper to the Royal Society in 1692. Symmes issued his Circular Number 1 from St. Louis in April 1818 and lectured for years; a polar expedition he hoped for never sailed. Jules Verne's Journey to the Centre of the Earth appeared in 1864 and Edward Bulwer-Lytton's The Coming Race in 1871. From 1945 the magazine Amazing Stories, edited by Raymond Palmer, printed Richard Shaver's tales of a cavern race as true, to great sales.
Why Hollow Earth matters
Hollow Earth shows a retired scientific hypothesis living on as legend, long after its first reason for existing had been answered.
How to read Hollow Earth
Historians of science cite Halley's version as a serious early model; writers of fiction take the inner world as a stage.
Hollow Earth in practice: an example
A reader of a claim about polar openings can ask why no ship or aircraft crossing the far north or south has recorded one.
Where readings of Hollow Earth go wrong
Maps and diaries said to prove polar entrances, including one credited to Admiral Byrd, are not authentic records.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Mystical Systems
- Aliases
- hollow earth theory, hollow earth meaning, inner earth, symmes hole, is the earth hollow
- Last updated
- 2026-09-26
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Common questions
Is the Earth hollow?
No such space has been found. No expedition has met an opening, and no measurement of earthquake waves passing through the ground has shown a great cavity. The deepest hole ever drilled, in Russia, reached about 12 kilometres and met only hot rock.
Who came up with the Hollow Earth theory?
Edmond Halley proposed a version with shells nested one inside another in 1692. The popular form with openings at the poles is due to the American John Cleves Symmes, who began promoting it in 1818.
How does Hollow Earth relate to Agartha?
Agartha is an underground kingdom described by French occult writers in the nineteenth century. Twentieth century authors placed it inside a hollow earth, joining two ideas that began separately.
