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The channels, roughly parallel to the coast, are between 10 and 100 meters wide and typically less than 10 m deep, says Jenna C. Hill, an oceanographer at Coastal Carolina University in Conway, S.C. She and her team discovered the enigmatic features while conducting oceanographic surveys about 100 kilometers off Georgetown, S.C., in the summer of 2006. Waters in the area range between 170 and 220 m deep, she notes.
Most of the trenches run along straight paths for several kilometers, and one
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