Five years ago, BP's out-of-control oil well deep in the Gulf of Mexico exploded. Eleven workers were killed on the Deepwater Horizon rig. But it was more than a deadly accident — the blast unleashed the nation's worst offshore environmental catastrophe.

In the spring and summer of 2010, oil gushed from the Macondo well for nearly three months. More than three million barrels of Louisiana light crude fouled beaches and wetlands from Texas to Florida, affecting wildlife and livelihoods.

Today, the spill's impacts linger.

On a remote string of barrier islands off the Louisiana coast, longtime outdoorsman Bob Marshall, an environmental writer for The Lens, steers his Twin Vee catamaran toward East Grand Terre. Marshall was on this island when the oil hit the shore in 2010.

"I'll never forget the day it came in here," he says. "It was the peak nesting season in April for brown pelicans."

He describes waves of reddish-orange gunk rolling in with the tide.

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