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Watch Horizon Season 39 Episode 1 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Horizon: The search for the 'real Atlantis' the ancient city of Helike, which was destroyed when an earthquake struck in 373BC, creating a tidal wave so vast that it was swallowed and has remained lost ever since. The expedition to uncover this major site is led by Dora Katsonopolou and Steven Soter, who hope to find a complete city and reveal a snapshot of life at the height of Grecian civilisation.