In this Aug. 14, 2010 file photo, survey technician Jim Burkitt adjusts bottles used to capture subsurface water samples on a Conductivity-Temperature-Depth, or CTD, carousel onboard the National Oceanic and Atmospheric Administration research vessel Henry B. Bigelow near the coast of Louisiana, Saturday, Aug. 14, 2010. The vessel is operating near the site of the Deepwater Horizon oil wellhead to collect subsurface water samples for analysis onshore as well as monitor oil and gas seepage on the seafloor. Scientists are giving different estimates on how much oil remains in the ocean and the long terms effects on the environment. (AP Photo/Patrick Semansky, File)
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