GULF OF MEXICO - National Incident Commander Admiral Thad Allen, National Oceanic and Atmospheric Administration scientist Sam Walker, NOAA Corps Director Rear Adm. Jonathan W. Bailey, and Entrix staff scientist Chelsea Murphy answer questions about snare sentinel boom operations near Grand Isle, La., Sept 14, 2010. Snare sentinel boom is deployed along the coast of Louisiana to help detect and track the presence of subsurface oil remaining from the spill. U.S. Coast Guard Video by Petty Officer 2nd Class Etta Smith.
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