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Roughly 300 miles from Okinawa, is the island of Yonaguni-Jima. Stretching southwest from Japan towards the mainland of China, only 30 miles from Taiwan, Yonaguni is the last of an island chain known as the Ryuku Islands.
 

 
In 1985, Kihachiro Aratake, a dive tour operator in Yonaguni, was scouting for a new site to view hammerhead sharks. After dropping into the water on the southeast side of the island, off a place called Arakawa Point, he discovered something that can only be described as shocking. Unseen for thousands of years, 60 to 100 feet beneath the ocean’s surface, was a pyramidal structure with expansive terraces, large angular steps, and flat vertical walls. It was divided into five distinct layers. Each step about 3 feet high with clean edges and sharp angles. Further investigation revealed symmetrical and angular channels, what appear to be clear cut stairs, round holes 7 feet deep, and angular raised platforms. The monument, to many having similarities to ancient buildings found on Okinawa, or even heiau temples on Hawaii, is over 300 feet long, 90 feet wide, and 45 feet tall. This enigmatic underwater megalith appeared to be man-made. Believing he had discovered a sunken city, and later naming it Iseki Point, Aratake announced his discovery. The news spread slowly, and it was not until 1997 that investigations led by Masaaki Kimura attracted media attention.
 
 
 
Although the structures seem clearly defined , there are some who disagree with the tale that the Yonaguni Monuments are man made. No chambers orentrances have ever been discovered, and no tools have been found in the surrounding area that would clearly indicate human involvement. Many believe that the formations can be attributed to erosion and/or coral settlements. The sharp angles and lines in the stone may be the result of erosion, causing the stone to break off at right angles. The cliffs above the sea tend to erode in a way that leaves naturally sharp angles. Professor Kimura's view is that if the sharp steps were the result of natural erosion there would be debris on the seabed surrounding them, in fact there is none. Others argue that Yonaguni's strong currents would have easily swept away any debris from the ocean floor long ago.
 
 
 
Although the structures seem clearly defined , there are some who disagree with the tale that the Yonaguni Monuments are man made. No chambers orentrances have ever been discovered, and no tools have been found in the surrounding area that would clearly indicate human involvement. Many believe that the formations can be attributed to erosion and/or coral settlements. The sharp angles and lines in the stone may be the result of erosion, causing the stone to break off at right angles. The cliffs above the sea tend to erode in a way that leaves naturally sharp angles. Professor Kimura's view is that if the sharp steps were the result of natural erosion there would be debris on the seabed surrounding them, in fact there is none. Others argue that Yonaguni's strong currents would have easily swept away any debris from the ocean floor long ago. 
 

 
 
 
                                      
 



 
The History Channel Presents: Japan's Mysterious Pyramids (Documentary DVD+R by A&E)