mightyspaceman, Around 40m off the coast that my school is situated on, there's been a bunch of action with a barge with an excavator on top. It's been picking up something from a container and dumping it into the sea off to the side - It's almost comical how the excavator causes the whole barge to sag to the left.
Apparently they're building an artificial reef - from what I heard, the material is something like oyster shells.
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