One of the most hotly debated underwater discoveries dates back to 1995 and is still producing differing theories today. A wayward diver stumbled across the ancient ruin site off the southern coast of Yonaguni, Japan. The site appeared to show huge stone blocks cut into the shape of stairs, paved streets and crossroads. The discovery is estimated to be around 10,000 years old, with many scientists believing it to be the remains of an ancient sunken city. Not everyone agrees though and some experts believe the large blocks are naturally formed and the result of tectonic movement. Whatever the answer may be, it is undoubtedly one of the greatest underwater wonders of the world.
Source: 3. Underwater Ruins. Japan | 20 Underwater Wonders of Our Blue Planet | EarthTripper| Page 1
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