GRAND ISLE, La.- National Oceanic and Atmospheric Administration scientist Sam Walker explains the capabilities and techniques the crew of the NOAA ship Pisces use to conduct subsurface oil monitoring operations near Grand Isle, La., Sept 14, 2010. Several different techniques to monitor and track subsurface oil remnants from the spill are being used off the coast of Louisiana. U.S. Coast Guard video by Petty Officer 2nd Class Etta Smith.
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