what kind of potential catastrophe is this?

What does this mean? What threat does this water pose? One might get wet? Or does the water come alive, form massive mouths in its waves and like monsters, chew you up?
(wild west: where the wild things are?) Is it about to rise out of control?

North Cottesloe beach is, for those who don’t know Western Australia, one of the most popular of Perth’s beautiful swimming beaches.

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