Workers construct a dam to keep oil from entering wetlands on Elmer's Island in Louisiana. Patrick Semansky/AP hide caption

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Oil leaks into the Gulf of Mexico from the end of the pipe that was supposed to pump oil from the sea floor before the Deepwater Horizon oil rig exploded and sunk last month. BP PLC/AP hide caption

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NPR News Investigations

Gulf Spill May Far Exceed Official Estimates

NPR Exclusive: Independent analysis suggests 10 times the amount of oil and gas may be leaking into Gulf waters than authorities are reporting.

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Researcher Sydney Levitus' work frequently transports him -- at least figuratively -- back to the helms of ships that plied the seas many decades ago. iStockphoto.com hide caption

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A boat with an oil boom tries to contain the spill, approximately seven miles from where the oil rig sunk last week. Gerald Herbert/AP hide caption

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A satellite captured the erupting of the Okmok Caldera volcano on Umnak Island in Alaska in July 2008. The volcano spewed both steam and ash. NASA/AP hide caption

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