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Watch National Geographic: Explorer - Easter Island Underworld online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Deep beneath the legendary Easter Island, National Geographic undertakes a groundbreaking expedition to map a vast cave system utilized by the people who carved these iconic statues. Protected by sheer cliffs, narrow labyrinths and underwater entrances, many of the caves have not been explored for decades. Recently discovered human remains and telltale artifacts reveal details of the island's intriguing history and culture.