The 300 foot Great Lakes Dredge and Dock dredge Alaska, left, and spider barge work together to deepen the shipping channel to the port of Savannah off the coast of Tybee Island, Ga., Monday, Sept. 14, 2015. The U.S. Army Corps of Engineers and the Georgia Ports Authority started the dredging the channel five days ago. The project will deepen the shipping channel from 42 to 47 feet at meal low water. (AP Photo/Stephen B. Morton)
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