The 2010 Deepwater Horizon oil spill may have been 30% bigger than previously estimated. A new study, published Wednesday in the peer-reviewed journal Science Advances, used three-dimensional computer simulations to track the spilled oil, finding the contamination reached the Texas shore, the Florida Keys, the coast of Tampa and parts of the east coast of Florida. The 2010 BP oil spill was one of the worst environmental disasters in U.S. history, which killed 11 workers and dumped at least 200 million gallons of oil into the Gulf of Mexico.