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Funded by NSF and developed and operated by WHOI, the NDSF AUV Sentry is capable of exploring the ocean down to 14,764 feet (4,500 meters) depth. Equipped with its advanced analytical systems, it was used in the Gulf of Mexico to characterize a subsurface plume of hydrocarbons. It was able to crisscross plume boundaries 19 times to help determine the trapped plume’s size, shape, and composition. (Photo by Dan Torres, Woods Hole Oceanographic Institution)