The Yonaguni Monument is a large underwater stone complex off the coast of a tiny Japanese island. After their discovery in 1987, divers and local academics thought the rock formations were human-constructed, indicating the presence of a yet-undiscovered ancient civilization. Could these structures unlock a new chapter of human history? Conspiracy Theories is on Instagram @theconspiracypod and TikTok @conspiracy.pod! Follow us to keep up with the show and get behind-the-scenes updates Learn more about your ad choices. Visit podcastchoices.com/adchoices
Chapter 1: What is the myth of Atlantis?
Ancient humans from all over the planet pass down a similar myth. They all tell the story of a lost civilization with advanced abilities. In some accounts, these people are gods. In others, they have eternal life. In the version you've probably heard, they create a culture in perfect harmony, a utopia. But a sudden flood engulfs the entire community.
All their buildings, technology, and knowledge are lost to the bottom of the ocean. Sounds familiar, right? That's the legend of Atlantis. Most agree the story is just that, a story. But why would so many prehistoric cultures, thousands of miles apart, be telling the same story? Some scuba divers and scholars think that's because it's true.
They think they've found the evidence off the coast of the small Japanese island of Yonaguni, the underwater ruins of Atlantis. Welcome to Conspiracy Theories, a Spotify podcast. I'm Carter Roy. You can find us here every Wednesday. Be sure to check us out on Instagram at The Conspiracy Pod. And we would love to hear from you.
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Chapter 2: Where is the Yonaguni Monument located?
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Yonaguni Island is part of a Japanese archipelago called Ryukyu. The chain of islands sweeps off the southwestern tip of mainland Japan. Yonaguni is the last of the group and one of the smallest. It's only about 20 miles in circumference. According to an episode of the show History's Mysteries on Yonaguni, you can drive around the whole thing in less than 40 minutes.
In 1987, Yonaguni local and scuba diving master Kihachiro Aratake is on the hunt for a hammerhead shark breeding ground. At the time, most visiting scuba divers come to see the unique sharks native to the area. So, Aratake sets out on his boat and drops anchor in an area he hasn't explored yet. As he glides near the ocean floor, about 80 feet below the surface, Aratake pauses,
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Chapter 3: Who discovered the Yonaguni Monument?
He can't believe what he's seeing. In the underwater gloom, he sees a massive stone staircase. Huge steps, perfectly parallel to the ocean floor with sharp 90 degree angles. Even through his wetsuit, he feels his hair standing on end and becomes unexpectedly emotional. His body seems to know before his brain. He is in the presence of something momentous.
Aratake swims upward, following the rocks toward the surface. It seems to go on forever. The steps rise up regularly, forming a pyramid shape. He can't seem to process what he's seeing. One thought keeps overwhelming everything else. people made this. I am looking at undiscovered ancient ruins. Aratake names the headland near the site Isekihonto or Ruins Point.
The rock structure he discovered becomes known as the Yonaguni Monument. Aratake returns often, bringing other divers whenever he can. Everyone who sees it has an experience similar to Aratake's. absolute wonder. Divers say it feels like traveling back in time or entering a mythical kingdom.
The entire structure is more than 500 feet long, almost as long as two football fields, and about 65 feet wide. At its highest point, it's almost as tall as an eight-story building. The steps define just one side of the pyramid-like structure. As Aratake and other divers continue to explore, they spot other features as well.
There's a narrow rectangular passage that leads right to the bottom of the staircase. The walls are flat and even, with another huge rock lying across the top to create the roof. Series of steps open up onto terraced platforms reminiscent of a stadium or amphitheater. Some lower parts of the complex have symmetrical grooves in them, narrow channels that are just wide enough to walk in.
They almost look like roads or small canals. Divers also notice two identical towers standing just four inches apart. All of it leaves them awestruck. With every dive, Aratake becomes more certain. He's discovered a man-made structure. It's time to bring in an expert. A marine geologist from nearby Ryukyu University agrees to examine the site. His name is Misaki Kimura, and he comes in skeptical.
But once he sees the structure for himself, Kimura's mindset shifts. He sees human intentionality and design in the symmetry and clean right angles. He connects the monument shape to the famous Egyptian pyramids. Kimura thinks he could be looking at the key to a new chapter of human history. Kimura and his team get to work measuring and documenting the site. They later publish their findings.
But it's not until photographs hit what is, at the time, a new platform, the World Wide Web, that news of the discovery spreads across the globe. By the mid-1990s, word of the ancient underwater ruins reaches a Boston-based geologist named Robert Schock. Schock made his mark in 1990 with his work on the Egyptian Great Sphinx. Historians thought they had correctly dated the Sphinx to 2500 BCE.
But when Schock applied some more modern dating techniques, he proved that the oldest parts of the enormous feline are actually thousands of years older. Schock isn't afraid to question the established academic narrative. In fact, he takes pride in upending it. Even with his open mind, Schock takes news of the monument with a grain of salt. New discoveries often come with a bit of exaggeration.
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Chapter 4: What evidence supports the monument as a man-made structure?
They get into the water with the same goal, to understand how this incredible stone structure ended up under the ocean. But they surface with two very different answers. Kimura, like Aratake, finds that each dive increases his certainty that the monument is ancient ruins. Everywhere he looks, he sees more evidence of human intervention. For Shock, it's the opposite.
He can come up with a natural cause for basically everything. Ever since 1997, Kimura and Shock have been locked in an academic discourse over the origins of the Yonaguni Monument. Kimura believes it is man-made. Shock believes it's a remarkable case of natural erosion. I'll give you both sides so you can decide for yourself.
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Marine geologist Masaaki Kimura believes the incredible stone structure under the ocean near Yonaguni is man-made. I've seen pictures of it myself. From my lay perspective, I can totally see why. Everything kind of feels like it's been designed with a purpose in mind. There are steps that height-wise look functional for humans.
There are these narrow, symmetrical passages that all seem to lead to the most dramatic and striking parts of the monument. The base looks really sturdy, like it could have been built with earthquakes in mind, since those are common in the area.
There are also parts of the structure that look like platforms and terraces, and other sections that rise up like towers with what appears to be artistic designs behind them. And there are channels, or what look like they could be roads to me, running along the bottom of the biggest part of the monument that lead to other stone structures nearby.
As Kimura performs more detailed examinations of the monument, he also finds several areas where he believes there is evidence of masonry work. One example is what Kimura thinks are three intentionally carved holes. They're all about the same size and are lined up in a row. Two are circular and one is hexagonal shaped. Kimura speculates they could have been used to hold posts for a gate or flags.
Kimura also says he found decorative carvings in the stone. Human faces and animal shapes, including a cow. The most dramatic one is an underwater sphinx with a face of an Okinawan king. But to really support his man-made hypothesis, Kimura has to address the next logical question. Who built it?
Kimura estimates the stone pyramid and surrounding complex were built about 10,000 years ago, or 8,000 BCE. The only known humans living on the Ryukyu Islands at that time are called the Jomon people. Based on what we know about the Jomon people, they tended to live near rivers or the coast in simple houses, basically a thatched roof over a hole in the ground.
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Chapter 5: What do experts say about the origins of the Yonaguni Monument?
They created clay figurines and carved intricate patterns into larger vessels like vases. There are a few details from the Jomon skills and lifestyle that could line up with the possible human touches on the Yonaguni monument. Archaeologists have found stone tools that date back to the Jomon period.
Assuming those tools were made from harder rocks than the sandstone that makes up the monument, the Jomon could be responsible for some of the carvings on the rock face. Current archaeological evidence suggests that Jomon's carving didn't become as detailed as what appears on the monument until thousands of years after its construction.
Divers had found pottery fragments and stone tools near the Yonaguni site that date to roughly 2500 BCE, much later than the monument itself. But even if the timeline doesn't totally line up, the style could. Although it's possible that the Jomon did the stone masonry work on the monument, it's hard to believe they built the entire thing.
Their lifestyle doesn't seem to suggest they were building massive stone structures. If they were capable of that, why did they live in holes? Plus, there isn't any evidence of similar stone work from the same period anywhere else in the area. That's why Kimura thinks a completely different population is behind the structure. And so far, no one has discovered proof of their existence.
Like I mentioned earlier, ancient populations all over the world have their own legends about an advanced civilization that suddenly disappears in a catastrophic flood. Kimura thinks it's possible that one of these stories isn't a legend at all. The evidence? Kimura thinks the Yonaguni Monument used to sit on an entire lost continent that used to occupy the middle of the Pacific.
It's called the Lost Continent of Mu. The legend of the continent of Mu was first brought to a Western audience in the mid-19th century by a Scottish writer named James Churchward. He learned about Mu from monks in India who claimed the story was inscribed on ancient tablets they guarded in their monastery.
The tablets described a massive landmass called Mu that connected Hawaii to Easter Island and Micronesia. that continent would have been over 7,000 miles across. That's two and a half times bigger than the width of the United States. According to Churchward, the people of Mu were sophisticated sailors. They explored the oceans and established colonies in different corners of the world.
At its peak, the continent of Mu supposedly held a population of over 60 million people. There are a few things about the Yonaguni Monument that make Kimura think it used to stand on the Mu continent. One is the location. Around 10,000 years ago, Yonaguni Island would have been located on the Tropic of Cancer, which would have made it astronomically significant.
It's possible that ancient humans on Yonaguni noticed the island's special location in relation to the stars and built the monument in honor of that. Lots of other prehistoric structures, like Stonehenge, seem to be constructed with the heavens in mind. Maybe the Yonaguni monument follows the same template. But Kimura thinks it's even more specific than that.
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Chapter 6: What is the connection between the monument and the Jomon people?
Komura noticed a stone nearby that points directly north and hypothesized that the people of Mu used it as a sundial. That could have served a practical purpose, like telling time, or it could have been more spiritual, representing a connection between the people on Earth and the awesome stars above.
Kimura also believes that the monument's history, when it was built and when it may have ended up underwater, fits in neatly into the Mu legend. In fact, it provides some real-life context that makes the story feel more real. According to the myth, the entire continent of Mu disappeared around the end of the last Ice Age. The timing here will sound familiar.
That was about 10,000 years ago, right around the same time as Kimura estimates that the Yonaguni Monument was constructed. As the Earth warmed at the end of the Ice Age, water levels rose worldwide, ocean coastlines changed rapidly, and there are records of other ancient humans being taken by surprise.
So it's not that the monuments, and perhaps the entire Mu continent it rested upon, got washed away in a flood. It could have been permanently submerged by an expanding ocean. Kimura compares the event to a massive tsunami that hit Yonaguni in 1771. That disaster caused the shoreline to rise 131 feet.
Finally, Kimura speculates that the monument and the people of Mu could be a missing piece in a mystery about ancient human history. To explain, let's talk a little more about pyramids. Ancient humans built pyramids all over the world, from Africa to Central America. The oldest can be found in Egypt and an area in the Middle East called Mesopotamia.
But scholars have never really been able to explain why pyramid structures showed up all over the world when the people who built them had no contact with each other. Unless... There was one advanced ancient culture that learned how to build a pyramid and then dispersed around the world spreading that knowledge.
Like the people of Mu, who could have constructed a stone pyramid on Yonaguni just before their entire homeland was engulfed by the Pacific Ocean. Perhaps when Aratake was looking for a hammerhead shark breeding ground, Instead, he stumbled upon the very first pyramid humans ever constructed.
Perhaps the people who built the Yonaguni Monument were the first to develop the complex mathematical, organizational, and architectural skills necessary to create such an intricate structure. Perhaps the only reason that so many other famous pyramids exist, Khufu, Tikal, Cestius, is because the Yonaguni Monument came first.
If that is the case, the Yonaguni Monument is proof of a legendary lost civilization. And that would upend our current understanding of human history. Right now, most scholars embrace a version of ancient human history that focuses on the Old World, which originated in Mesopotamia around 3,000 or 4,000 BCE.
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Chapter 7: Could the Yonaguni Monument be linked to a lost civilization?
if Kimura's theory is correct. Perhaps all advanced ancient civilizations can be traced back to a single, ill-fated population whose destruction pushed them to share their knowledge around the world. Maybe the Yonaguni Monument isn't just the first pyramid and the first evidence of a mythical lost kingdom. It could also be the origin of modern humanity as we know it.
Masaaki Kimura is ready to change our understanding of human history with his theory about the man-made Yonaguni Monument. But not everyone in his academic community agrees with his hypothesis. Robert Schock, the geologist from Boston we discussed earlier, is as awestruck by the underwater site as any other diver. Not because he thinks humans made the incredible formation in front of him.
He assumes it's a miracle of Mother Nature. Less Great Pyramids and more Grand Canyon. Let's break it down by feature. Schock finds the dramatic narrow entrance to the monument remarkable. He's impressed by the perfectly vertical and symmetrical stones that wall the rectangular corridor and the flat level rock on its roof.
In Schock's mind, this is a natural stone passage created by normal splintering in the rocks. For the roof, he sees another rock that fell from the shore or somewhere else on the monument. It was a lucky landing that created the tunnel. Shock agrees with Kimura and Aratake that the step pyramid side of the monument is familiar.
Sure, it does bear some resemblance to other famous pyramids around the globe, but it also looks like something a whole lot closer. the coastline right above the monument. As Schock looks at other geological formations around Yonaguni Island, he notices that the cliffs along the shoreline have also worn down into step-like shapes.
Schock discusses this in the Histories Mysteries episode we mentioned earlier. He says he can't be sure without more testing, but it seems like a reasonable assumption that the monument and the shoreline are made up of the same kind of rock. If the coastline wore down into a step structure, it follows logically that the monument would wear the same way.
It looks like the monument is made up of sedimentary rock. That means different kinds of rock compressed together into layers. When it's under pressure, like being underwater, this kind of rock often has vertical breaks at seams. With weathering, like constant exposure to ocean currents, layers of rock can peel off horizontally.
That would create the step-like structures that have become the focal point of the monument. Schock thinks something else shaped the rocks too, the tectonic plates beneath them. Japan is well known for their earthquakes and seismic activity could also be responsible for big dramatic breaks along seams in the rock.
Schock has a similar explanation for the little canals near the bottom of the monument and the symmetrical twin towers jutting out of it. The same kind of breakage along natural seams in the rock could create both structures. In fact, they're really the same structure. One is just oriented horizontally, the other vertically.
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Chapter 8: What is the Lost Continent of Mu?
Certain perspectives emphasize right angles and symmetry that can be less pronounced in person. Schock also thinks he can debunk what Kimura speculates is stone masonry work. First, the depressions in the rock that Kimura says are post-supports. Shock thinks they could be the result of ocean eddies scouring down the face of the rock.
Marine animals also like to find small cracks and expand them to create a safe place to hide from predators and the rough ocean currents. The holes are all in a straight line, which seems to indicate human intention, but the straight line makes perfect sense to shock as a natural result of sedimentary erosion.
All the holes are worn in the same layer of rock that was softest, and therefore most prone to the wearing effect of the ocean. As far as the decorative carvings, Shock just doesn't see them. What looks intentional and artistic to Kimura looks like regular wear and tear to Shock. Shock compares it to looking at clouds and seeing shapes.
Everyone can see something different, and chances are they might be more inclined to see what they want to. It seems like local and international officials side with Shock's line of thinking. Back in 2007, Kimura said the local government and members of the United Nations were interested in exploring the human significance of the monument. But as far as we can tell, they never followed through.
As of 2007, Yonaguni Monument didn't have any kind of official protection as a historic site. As more academics have explored the Yonaguni Monument, they've tended to agree with shock as well. Takeyuki Ogata, a geologist from the same university as Kimura, worked on a team that researched the monument in 2016. All those geologists agree, the monument is natural, not the result of human handiwork.
Camaro continues to take a position that opposes Schock's claims. He points out that if the monument is the result of breakage along seams in the larger rock face of the monument, there should be boulders on the ocean floor. He also cites the difficulty of exploring the monument. There are so many hurdles to getting experts out to examine it.
Travel to a remote part of the world, scuba certification, proper conditions around the monument, and so much more. If more mainstream scientists could explore it, more will be revealed. But no matter what you believe, there's no doubt that the site is an absolute phenomenon.
natural or not there is nothing else like it on the planet everyone who lays eyes on it can't help but marvel in wonder it's a universal experience that would have been shared by our ancestors should they have come upon the monument when it was still on dry land.
Even if they didn't create the structure itself, they certainly could have admired it, climbed it, or even used it as a site for celebration or religious ceremonies. And maybe they even made some of those carvings that Kimura spotted. Even Shock admits, he can't say definitively whether the ocean made those marks over thousands of years,
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