Stel and Jess investigate a mysterious Greek island where an ancient civilisation built a massive marble pyramid. Could this structure lead them to Atlantis?

Stel and Jess explore underwater ruins off the coast of Greece. Their quest to find Atlantis leads them on ancient trades routes and into the heart of a volcano.

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.

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 begin their search for the lost city of Atlantis. In Bulgaria, they uncover mysterious gold treasure and evidence of an ancient catastrophe.