Gulf gusher is far and away the biggest U.S. spill

As cleanup efforts progress, scientists try to track oil roaming below the surface

3:47pm, June 9, 2010

The catastrophic explosion on April 20 of an offshore oil-exploration platform in the Gulf of Mexico sent oil slicks coasting toward shorelines from Louisiana to Florida. Now research vessels are tracking a more stealthy threat: huge clouds of diffuse, nearly invisible oil droplets hovering deep below the surface.

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