Environment

Oil Spill in Gulf of Mexico

A blanket of fog lifts, exposing a band of rainbow sheen that stretches for miles off the coast of Louisiana. From the vantage point of an airplane, it's easy to see gas bubbles in the slick that mark the spot where an oil platform toppled during a 2004 hurricane, triggering what might be the longest-running commercial oil spill ever to pollute the Gulf of Mexico.

Yet more than a decade after crude started leaking at the site formerly operated by Taylor Energy Company, few people even know of its existence. The company has downplayed the leak's extent and environmental impact, likening it to scores of minor spills and natural seeps the Gulf routinely absorbs.

An Associated Press investigation has revealed evidence that the spill is far worse than what Taylor — or the government — have publicly reported during their secretive, and costly, effort to halt the leak. Presented with AP's findings, that the sheen recently averaged about 91 gallons of oil per day across eight square miles, the Coast Guard provided a new leak estimate that is about 20 times greater than one recently touted by the company.

Outside experts say the spill could be even worse — possibly one of the largest ever in the Gulf. Taylor, a company renowned in Louisiana for the philanthropy of its deceased founder, has kept documents secret that would shed light on what it has done to stop the leak and eliminate the persistent sheen.