I don't really know what it does Arch, for a while, it was driving up and down the beach, Then it went into the water, it actually went further in than the pic shows.
My guess is its used by the surveyers, they kept the new dune at a level height 18 miles long
They kept a dredging ship just offshore, and a large pipe that blasted sand up pn the beach....felt like an endless series of small earthquakes....I had to re-spackle some seams that split afterwards....