It’s almost impossible to understand it if you weren’t here then. One April morning in 2010 the Gulf of Mexico exploded. Hundreds of millions of gallons of oil roared up out of an undersea volcano and smeared across 70,000 miles of ocean. Destruction swept closer and closer to the world’s most beautiful and fragile beaches. The economy buckled. Governments panicked. For 80 days it got wider and worse. Then it stopped, sort of.