By Ana Lisa Alperovich, Source: Inhabitat

More than 70 percent of our planet is covered with water, yet the oceans are still the most mysterious parts of the world. Deep-sea photographer and diver Yoji Ookata discovered something he had never seen in his 50 years documenting the underwater world off the coast of Japan: a beautiful circular structure on the sand, about 80 feet below sea level that was so accurately carved that it looks like a deep-sea crop circle.

See more at: Inhabitat