Toxic and invisible oil spread well beyond the initial footprint of the Deepwater Horizon oil spill, new research reveals.

A study led by scientists at the University of Miami Rosenstiel School of Marine and Atmospheric Science combined oil-transport modeling with remote sensing and in-water analysis to gain a comprehensive understanding of what took place after the oil spill on April 20, 2010.

"We found that there was a substantial fraction of oil invisible to satellites and aerial imaging," said the study's lead author, Igal Berenshtein, a postdoctoral researcher at the UM Rosenstiel School, in a statement. "The spill was only visible to satellites above a certain oil concentration at the surface leaving a portion unaccounted for."

When the oil rig exploded, 210 million gallons of crude oil spewed into the Gulf of Mexico for 87 days — making the disaster the country's largest oil spill. Oil slicks covered about 57,000 square miles.

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On April 20, 2010, the Deepwater Horizon oil rig exploded, creating the largest oil spill in U.S. history. (US Coast Guard)

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"Our results change established perceptions about the consequences of oil spills by showing that toxic and invisible oil can extend beyond the satellite footprint at potentially lethal and sub-lethal concentrations to a wide range of wildlife in the Gulf of Mexico," Claire Paris, senior author of the study and professor of ocean sciences the UM Rosenstiel School, said in a statement.

Researchers hope their framework can help officials and emergency responders with the management of any future oil spills.

“This work added a third dimension to what was previously seen as just surface slicks. This additional dimension has been visualized with more realistic and accurate oil spill models developed with a team of chemical engineers and more efficient computing resources," Paris explained.

The findings were published Wednesday in the journal Science Advances.

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