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Watch Horizon Season 42 Episode 9 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Horizon: The threat posed by a geological structure underneath the Pacific Ocean off the west coast of America, which could cause a powerful earthquake similar to the one responsible for the Boxing Day 2004 tsunami in Asia. Experts speculate on what sort of damage such a tremor might inflict, and reveal what precautions are being taken to guard against another major disaster.