A robotic subsea craft has discovered a 22-mile-long chemical plume located near the site of BP's ruptured Deepwater Horizon well in the Gulf of Mexico, but 3,000 feet below the ocean surface. Scientists fear that the plume, partially composed of petroleum hydrocarbons consisting of benzene, toluene, ethylbenzene and xylenes, may affect deepwater ecosystems. Additional data also suggest that natural sea microbes aren't consuming the plume as fast as hoped.

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