WWL | A look at oil spill readiness 7 years after BP WWL That's because, in the seven years since the Deepwater Horizon oil rig exploded and set off the worst environmental disaster in U.S. history, an average of more than four chemical spills in the Gulf of Mexico were reported to the U.S. Coast Guard per ... 7 years after Deepwater Horizon oil spill, Louisiana dolphins struggle to reproduce BP Gulf Oil Spill Damage Valued at $17.2 Billion in New Study Deepwater Horizon: Seven years after explosion and oil spill, study finds clean-up workers got sicker |