The Hollow Earth Theory's Long Life

Somewhere beneath the crust, past the reach of any drill, there is another sky. An inner sun hangs at the centre, warming a green interior land where unknown peoples — or ancient masters, or the survivors of a lost race — live out of sight of the surface world. The way in is at the poles, through vast openings that explorers keep almost reaching before the ice or the funding turns them back. This is the hollow earth, and it has been quietly resident in the Western imagination for more than three hundred years, changing tenants but never quite falling vacant.

What makes it worth following is the sheer durability of the picture, and the way each generation renovates it for its own purposes — the question of whether the planet is solid was settled long ago. The hollow earth is one of the great worked examples of a myth that will not die because it keeps being useful.

It began as respectable science

The idea’s first landlord was no crank. In 1692 Edmond Halley — the astronomer of the comet, and one of the sharpest minds of the Royal Society — proposed that the earth might be built of concentric shells, a smaller sphere or two nested inside the outer one, separated by atmosphere. He was trying to solve a genuine and stubborn problem: compass needles did not point steadily, and the pattern of magnetic variation shifted over the years as though more than one magnetic field were in play. Halley’s nested spheres, each with its own poles rotating at slightly different rates, was an honest attempt to account for the data. He even speculated that luminous gas escaping from the interior might explain the aurora, and that the inner shells could be inhabited.

It was wrong, but it was the right kind of wrong — a testable model built to fit an anomaly, published by a serious scientist in a serious venue. That respectable birth matters, because it gave the idea a pedigree that later enthusiasts could always point back to. The hollow earth did not crawl out of the fringe. It was handed down from the Royal Society, and it never forgot it.

The man who declared it

The theory’s transformation from curiosity into crusade belongs to one American. In 1818 John Cleves Symmes Jr., a war veteran and merchant from Ohio, printed a circular and sent it to institutions across Europe and the United States: “I declare the earth is hollow and habitable within; containing a number of solid concentric spheres, one within the other, and that it is open at the poles twelve or sixteen degrees.” He attached a note certifying his own sanity and pledging his life to proving the claim.

Symmes spent the rest of his years on the lecture circuit describing the polar openings that came to be called “Symmes’s Holes”, through which a ship could sail down into the interior. He never wrote a proper book, but a follower published Symzonia in 1820, a novel of a voyage into a utopian inner world, and Symmes lobbied hard for a national expedition to the South Pole to find the opening. The lobbying half-worked: his associate Jeremiah Reynolds carried the polar-exploration enthusiasm forward, and the United States Exploring Expedition of 1838, the Wilkes Expedition, owed part of its political momentum to the excitement Symmes had stirred — though by the time it sailed, its aims were straightforwardly scientific and it charted a long stretch of the Antarctic coast that put a solid continent where the hole was supposed to be.

Symmes’s monument in Hamilton, Ohio, is topped with a small stone hollow globe. It is a fair emblem for the whole tradition: a sincere man, a genuine memorial, and a completely empty theory carved in stone above him.

The idea also caught a young Edgar Allan Poe. Reynolds’s polar advocacy fed directly into Poe’s fiction — the vertiginous descent of “MS. Found in a Bottle” and the plunge towards a white polar cataract that ends The Narrative of Arthur Gordon Pym of Nantucket both carry the Symmesian pull towards an opening at the bottom of the world. There is a much-repeated account that Poe, delirious in his final hours in Baltimore in 1849, called out the name “Reynolds” over and over. Whether or not the deathbed detail is reliable, it captures how deep the polar-hole image had sunk into the century’s imagination: a serious writer worrying at it in his last confusion, an idea already more literary than geological and gathering the emotional weight that would carry it for another century.

The version where we live inside

The strangest branch grew in Florida. Cyrus Teed, a physician and alchemist who rebranded himself Koresh after a vision in 1869, taught that the geometry was inside out — that we are already living on the inner surface of a hollow sphere, with the entire universe, sun and stars included, compressed into the space overhead. The sky is an optical illusion produced by the dense atmosphere at the centre. Teed founded a community, Koreshan Unity, built a settlement at Estero, and in 1897 his followers ran a survey along the Gulf coast with a device called the “rectilineator”, which they announced had proved the earth curved upward.

Teed’s concave earth is a cousin of the flat-earth revival that keeps rediscovering the same objections online: both start from the intuition that the world we can touch is the whole world, and both dress a deeply felt sense of centrality in the language of measurement. The Koreshans genuinely believed their instrument. What it measured was their own conviction, tightened by a survey method rigged, unconsciously, to return the answer they already held.

Where the mystics moved in

By the late nineteenth century the interior had filled with more than geology. The occult revival gave the hollow earth a population. Edward Bulwer-Lytton’s 1871 novel The Coming Race imagined a subterranean master-species, the Vril-ya, sustained by a mysterious energy called Vril — a fiction that later esotericists took, at least half-seriously, as veiled truth. Theosophical and later writers folded in Agartha and Shambhala, hidden kingdoms of enlightened adepts, and relocated them underground. In the twentieth century this occult inner world was absorbed into fringe Nazi mysticism and, after the war, into a persistent legend that the Third Reich had fled through a polar entrance to a redoubt beneath the ice — a story with no evidence and a great deal of appeal to people who could not accept that the villains had simply died.

The literary hollow earth ran in parallel and fed the belief constantly. Ludvig Holberg sent his hero underground in Niels Klim in 1741. Jules Verne’s Journey to the Centre of the Earth (1864) gave the interior its definitive adventure grammar of caverns and prehistoric seas. Edgar Rice Burroughs built the whole world of Pellucidar, lit by a central sun, across a run of novels from 1914. Fiction and belief traded furnishings back and forth until it became hard to say which had supplied which. Bulwer-Lytton had meant the Vril-ya as satire, and Vril as a made-up word for a made-up force; within a generation it had escaped him entirely, lending its name to a beef-extract drink and, more strangely, to occult societies that spoke of Vril as though it were a real and recoverable power. This is a recurring pattern in the tradition — a writer invents a detail as ornament, a reader takes it as testimony, and the ornament hardens into doctrine that outlives the book. The Nazi-redoubt legend worked the same way, grafting the interwar occult inner-world onto the very real fact that senior figures had vanished or died in ambiguous circumstances, and offering the tidy consolation that the surface world had not, after all, seen the last of them.

The admiral and the opening

The modern American version crystallised around a real man who never said any of it. Rear Admiral Richard Byrd led genuine, celebrated flights over both poles and Antarctic expeditions including the large 1946–47 naval operation Highjump. In the retelling that spread through hollow-earth literature — cemented by Raymond Bernard’s 1964 paperback The Hollow Earth — Byrd was said to have flown through the polar opening and glimpsed a warm land of lakes and forests beyond the ice. A forged “secret diary” circulated later, quoting the admiral’s wonder at the inner realm. Byrd’s actual logs record cold, wind, and the ordinary marvels of high-latitude flight. The legend simply annexed his authority, the way it had annexed Halley’s, because a decorated polar explorer was precisely the witness the story needed.

The same instinct that plants a hidden civilisation under the ice is at work when people insist a buried pre-flood culture built the great stone sites or read the Nazca lines as runways for visitors from elsewhere. All three want the same thing: a chamber of the world that official knowledge has missed, still waiting, still full.

What the interior is really for

The idea never left the internet

The hollow earth might have faded into a museum curiosity had the twentieth century not kept renewing it, and the twenty-first has proved an unexpectedly hospitable landlord. Every few years a satellite image of the Arctic — a compositing artefact where the map projection has no data at the pole, rendered as a dark circle — circulates as photographic proof of the northern opening. Fringe publishers keep Bernard’s The Hollow Earth in print, and a steady traffic of videos re-narrates the Byrd legend, the Nazi-base story, and the Agartha teachings to new audiences who have never heard of Symmes and do not need to. The theory has learned to travel without its own history, arriving each time as if freshly discovered.

That freshness is part of the appeal. A believer today can feel like an original researcher, piecing together the anomalies — the compass, the aurora, the “missing” polar footage, the admiral’s supposed confession — into a pattern that the authorities have suppressed. The pattern is old and the pieces are all accounted for, but the experience of assembling them is genuinely thrilling, and it is that experience, more than any single claim, that the modern versions sell.

The planet is not hollow. Seismology settled that beyond argument: earthquakes send waves through the deep earth, and the way those waves bend, split, and cast shadows reveals a molten outer core and a solid inner core of iron and nickel, dense and continuous, with no cavity to hold an inner sun. The measurement of the earth’s mass, known since Cavendish weighed the world in 1798, gives an average density far too high for a shell. There is no opening at either pole; both have been overflown, mapped, and stood upon.

And still the interior stays occupied, because it answers a wish that no survey can reach. A hollow earth means the map is not finished. It means there is somewhere left that no satellite has photographed and no state has claimed, a reserve of undiscovered space in an age that has run out of blank coastline. It offers hidden benefactors — masters, ancients, a lost and better race — watching from below, which is a comforting thought for anyone who suspects the surface is being run badly. And it promises that the things we have lost, the vanished civilisations and the defeated enemies and the pre-flood wisdom, were merely relocated, a floor down, still there to be found.

Halley reached for the inner spheres to explain a wandering compass. Symmes gave his life to a hole that was never there. Teed’s followers surveyed themselves into the centre of creation. Each of them was doing the oldest thing a curious species does with a world it cannot fully see into: imagining that the darkness underneath is a room rather than solid rock. The hollow earth survives because that room is one we would still, against all the evidence, very much like to enter.