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The scientists needed to distinguish how much oil versus gas was leaking from the well. To collect and analyze the well fluid itself, WHOI scientists used an isobaric gas-tight sampler, or IGT, a deep-sea device developed at WHOI to sample hydrothermal vent fluids. A pristine fluid sample from within the well was crucial to understand what fraction of the flow was oil. The manipulator arm of a robotic vehicle (upper right) moves the IGT sampler toward the jet of hot oil and gas shooting out of the broken drill pipe. (Photo courtesy of Oceaneering)