It's to stop erosion rather than big waves, but there are big boulders and groynes (I think that's the word) heading out at odd angles to break up incoming rollers...
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Paul Clarke's blog - I live in Hythe in the deep South. Married + father to 2, I am a full-stack web engineer, and I do javascript / nodejs, some ruby, python, php ect ect. I like pubbing, running, eating, home automation and other diy jiggery-pokery, history, genealogy, Television, squirrels, pirates, lego, + TIME TRAVEL.