Stel and Jess trek to the Black Sea where they investigate a 7,000-year-old skeleton buried in gold treasure, and uncover evidence of an ancient catastrophe that could be the basis for Noah's flood and the destruction of Atlantis.

Stel and Jess dig into unexplored archeological sites along the Adriatic coast of Croatia where underwater relics from an ancient bridge system lead them to an age-old legend of a lost city and into a massive sinkhole that could swallow a city whole.

Stel and Jess investigate cave paintings in Turkey that match an advanced civilisation that built the world's oldest city. Tracing their ancient migration to the coast they discover a shifted shoreline and ruins of a lost city right under their feet.

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.

Stel and Jess search ancient underwater ruins off the coast of Greece and follow the trade routes of the Minoan civilisation to a circular island and the heart of a volcano where a modern city now sits atop what could be the ruins of Atlantis.

Stel and Jess investigate a mysterious Greek island where an advanced ancient civilisation built a massive marble pyramid. Artifacts there lead them to Turkey where ground penetrating radar reveals an incredible find in the shadow of ancient Troy.