The small motorboat anchors in the middle of the Chesapeake Bay. Shrieks of wintering birds assault the vessel's five crew members, all clad in bright orange flotation suits. One of the crew slowly pulls a rope out of the water to retrieve a plastic tube, about the length of a person's arm and filled with mud from the bottom of the bay. As the tube is hauled on board, the stench of rotten eggs fills the air.
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