What do you, have your masters in Internet research or something?
Well done!
That's not a wharf, it's far too high above sea level.
https://files.catbox.moe/k6aymp.jpg - image from prior to erosion
I think they wanted to try and stabilize that cliff for its scenic views and to allow people to walk up to the edge, so they drilled down through the sand below sea level and filled those shafts with concrete.
It is, indeed, an impressive pluck.
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