re: Changing Shifts at the Most Dangerous Lighthouse in the World

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But after 100 or so years, the waves have eroded most of that rock away. Probably much easier to build it when it was sitting on a rock that may have been massive

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Erosion, even by wave action that substantial, would take longer than 100 years to accomplish the assumed elevations needed.

They likely worked according to tidal changes as well as developing some sort of coffer damn system.