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The Yonaguni Monument (officially the Yonaguni Submarine Topography)
is one of the world's most debated underwater mysteries.
It is a massive, submerged rock formation located off the coast of
Yonaguni Island, the westernmost island of Japan's Ryukyu Archipelago,
in Okinawa Prefecture.

Here are the key details and the core of the controversy:

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🏛️ Key Characteristics

Discovery: It was first noticed in 1986 by a local diver, Kihachiro Aratake, while scouting for hammerhead sharks.
Appearance: The structure is colossal, measuring about 150 meters (492 ft) long and 40 meters (131 ft) wide, with a maximum height of around 27 meters (89 ft)**. Its most striking features are its uncanny geometric appearance, including:
Massive, stepped terraces that resemble a stepped pyramid or ziggurat.
Sharp, straight edges and 90-degree angles.
Features resembling staircases, paved streets, stone columns, and even a large rock formation that some claim looks like a carved face or a turtle.
Depth: The top of the main structure is quite shallow, only about 5 meters (16 ft) below the surface, while the base sits at about 25 meters (82 ft). This shallow depth makes it accessible for divers.
Geology: The rock is composed primarily of sandstone and mudstone of the Lower Miocene Yaeyama Group, which is believed to be about 20 million years old.

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⚔️ The Controversy: Man-Made vs. Natural Formation

The central debate revolves entirely around its origin.

Theory 1: Man-Made Structure (Ancient Civilization)

Proponents (e.g., Marine Geologist Masaaki Kimura, Author Graham Hancock) argue:**

Geometric Precision: The perfect right angles, flat surfaces, symmetrical design, and repetitive features are too precise and concentrated to be solely natural.
Context: Features like channels, apparent roads, and monolithic pillars suggest human planning and construction.
Age Implication: If man-made, the structure must have been carved when it was above sea level, which would have been at least **8,000 to 12,000 years ago (during the last Ice Age). This would make it one of the oldest monumental structures in the world, predating the Egyptian pyramids and Stonehenge, and would require a total revision of human history regarding early sophisticated civilizations.

Theory 2: Natural Geological Formation

Proponents (e.g., Geologist, other mainstream geologists) argue:

Natural Rock Properties: The sedimentary rock (sandstone) in the region naturally contains numerous, well-defined, parallel bedding planes and linear joints (fractures) along which the rock easily breaks. Tectonic activity and erosion over millennia would naturally exploit these weaknesses, creating sharp edges, flat faces, and step-like structures that mimic human architecture.
Lack of Evidence: There is a distinct lack of compelling archaeological evidence, such as tools, definitive carving marks, pottery, or other artifacts that would conclusively prove human activity.
Geological Context: Similar step-like formations exist above water on the island, and the entire region is prone to intense seismic activity, which could fracture the rock mass. The current's strength also contributes to the shaping and cleaning of the rock faces.
Pareidolia: Many of the "carvings" and "animal statues" cited by proponents are likely examples of pareidolia, where the human brain perceives familiar patterns (like faces or animals) in random data.

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🤷 Conclusion

Despite decades of diving, study, and heated debate, there is no official consensus on the origin of the Yonaguni Monument.

Mainstream geology and archaeology tend to favor the natural formation theory, possibly with minor modification by ancient humans. Conversely, those in the fields of marine geology and alternative history often hold strong to the man-made theory, viewing it as a remnant of a lost, advanced Ice Age civilization.

For now, the Yonaguni Monument remains a fascinating and enduring enigma of the deep, drawing experienced divers and inspiring global speculation.




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