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Watch National Geographic: The Next Mega Tsunami online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Ten years after one of the most deadly tsunamis ever known, scientists are making a shocking discovery. Experts used to believe that the biggest killer waves were only generated in a handful of regions, but mounting evidence now suggests that more of the world’s coasts, from the Mediterranean to Australia, could be in grave danger. But where will the next Big One strike?