In Termination Shock, by Neal Stephenson, he writes about a structure in the Netherlands designed to prevent tidal surges from destroying inland property. I thought it was something he'd made up until he mentioned a date when it was constructed that predates today (the book is set a bit into the future).
As I read his description, my brain kept saying, "He can't mean that, no, what?", but apparently, he did a rather good job of describing this thing in words, because when I looked it up, it matched what I had imagined!
Those big arms rotate out into the water, where they join up, and then sink, to create a barrier.
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