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In June 2010, a WHOI-led team used the autonomous underwater vehicle Sentry in the Gulf of Mexico to define and characterize the deepsea hydrocarbon plume from the Deepwater Horizon spill. Sentry, equipped with a miniaturized mass spectrometer called TETHYS, was able to crisscross plume boundaries 19 times to help determine the trapped plume’s size, shape, and composition. (Photo by Chris Reddy, Woods Hole Oceanographic Institution)