According to some researchers, a number of pyramid-like structures were found under the sea near the island of Okinawa. The structures are found at a depth of  20-30m and are dated back to 8.000 BC.

The nature and origins of the underwater structures near Okinawa ignited a conflict between professional and amateur archaeologists and. Many believe that they are simply geological shapes  of admirable symmetry, while other support that they are human structures of significant size.

The cycle of discoveries began in 1995 when divers located curious shapings. More detailed surveys produced photos and maps on which the shapes are depicted. Most photos show a large underwater shape or structure of 120m length and a width of 60 m that resembles the pyramids in Central America. At the same time smaller shapings have also been located around the central platform, giving the overall impression of an organized construction scheme. Some Japanese scientists believe that the structures dated between 5.000 and 12.000 BC, a fact that contradicts all existing knowledge on the cultural and technological level of the region at that time.