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In Turkey, Stel and Jess investigate ancient cave paintings that could be connected to Atlantis. And, they examine a shifted shoreline and ruins of a lost city.
Stel and Jess dig into unexplored archaeological sites along the Adriatic coast of Croatia. They find a network of sinkholes big enough to swallow an ancient city.
Stel and Jess sail to Sicily to explore Europe's largest active volcano. Their investigation leads them to a hidden labyrinth and a mysterious underwater monolith.