In this March 20, 2014 photo, a map of the ocean floor along the mid-continental shelf off South Carolina is displayed on a computer aboard the research vessel Savannah in Charleston Harbor in ... more 
In this March 20, 2014 photo, a map of the ocean floor along the mid-continental shelf off South Carolina is displayed on a computer aboard the research vessel Savannah in Charleston Harbor in Charleston, S.C. College of Charleston students aboard the vessel completed several days of mapping the ocean bottom off South Carolina. The winding areas on the map that resemble rivers are channels carved in prehistoric times when sea level was lower and the coastline farther east than it is now. (AP Photo/Bruce Smith) less 
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Associated Press | Photo By Bruce Smith
Sat, Mar 29, 2014 9:03 AM EDT