Tags: ancient civilization, archaeological revelations, civilization origins, coastal civilizations, coastal discoveries, coastal lands, Ice Age history, Japan's heritage, lost worlds, marine exploration, oceanic civilizations, oceanic history, prehistoric civilizations, Ryukyu history, sea level changes, submerged relics, underwater civilizations, underwater discoveries, underwater treasures, Yonaguni ruins
Diving Into Japan’s Ancient Underwater Civilization | Underworld | Earth Stories
