In this March 20, 2014 photo, Scott Harris, center, an associate professor in the department of geology and environmental geosciences at the College of Charleston, deploys a sidescan sonar unit with two students from the college from the back of the research vessel Savannah in Charleston Harbor in Charleston, S.C. Students aboard the vessel completed several days of mapping the mid-intercontinental shelf off South Carolina. (AP Photo/Bruce Smith)
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