Scientists used an ROV to examine the seafloor off the coast of Puerto Rico. They found that a landslide scar was much older than previously thought, so it couldn’t be the source of a 1918 tsunami. Credit: Uri ten Brink.

Scientists used an ROV to examine the seafloor off the coast of Puerto Rico. They found that a landslide scar was much older than previously thought, so it couldn't be the source of a 1918 tsunami. Credit: Uri ten Brink.

Scientists used an ROV to examine the seafloor off the coast of Puerto Rico. They found that a landslide scar was much older than previously thought, so it couldn’t be the source of a 1918 tsunami. Credit: Uri ten Brink.

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