Five years ago, following a blowout and explosion on the Deepwater Horizon rig that killed 11 workers, the nation was spellbound by the 87-day visual of oil flowing freely into the waters of the Gulf of Mexico from the Macondo well. The 3.1 million barrels of spewed oil has been called “the world’s largest accidental marine spill” and “the worst environmental disaster in U.S. history.”