Mysterious Underwater Cities Discovered All Around the World: Ancient Civilizations

First published at 17:47 UTC on November 19th, 2021.

Over 70% of the Earth's surface is covered by water, nearly all of it ocean. And yet, only 5% of the world's oceans have been explored by human beings, the remaining 95% still a dark and uncharted frontier. What secrets might lie within th…

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